INI-CET 2025 — Ophthalmology

Q: Which of the following investigations allows examination of all layers of the retina?

OCT. ### **Explanation** **Optical Coherence Tomography (OCT)** is the correct answer because it functions as an **"optical biopsy"** of the retina. It uses low-coherence interferometry (near-infrared light) to produce high-resolution, **cross-sectional images**. This allows clinicians to visualize and measure all **ten layers of the retina** individually, from the Internal Limiting Membrane (ILM) to the Retinal Pigment Epithelium (RPE) and even the underlying choroid. #### **Why the other options are incorrect:** * **B-scan Ultrasonography:** This is a two-dimensional acoustic imaging technique. While excellent for detecting gross structural changes (like retinal detachment or intraocular tumors) when the ocular media is opaque (e.g., dense cataract or vitreous hemorrhage), it lacks the resolution to distinguish individual retinal layers. * **Perimetry:** This is a **functional** test (not structural) used to map the visual field. It identifies blind spots (scotomas) but cannot visualize the anatomical layers of the retina. * **Fundus Fluorescein Angiography (FFA):** This is a dynamic study of the **retinal vasculature**. While it is the gold standard for detecting leaks, neovascularization, and capillary non-perfusion, it provides a "top-down" view and cannot differentiate the depth or thickness of specific retinal layers. --- ### **High-Yield Clinical Pearls for INI-CET:** * **OCT Principle:** Based on **Michelson Interferometry**. * **Resolution:** OCT has a resolution of **5–10 microns**, which is significantly higher than B-scan (~150 microns). * **Key Indications:** Best for diagnosing **Macular Hole**, **Epiretinal Membrane**, and **Cystoid Macular Edema (CME)**. * **Inverted Image:** In OCT, the RPE is the most hyper-reflective (brightest) outer band. * **Swept-Source OCT (SS-OCT):** The newest generation that uses longer wavelengths to penetrate deeper into the **choroid**. [Practice more Ophthalmology PYQs on OnCourse]

10 Previous Year Questions with Answers & Explanations

Questions

Which of the following best defines blindness?

A patient presented 2 weeks after cataract surgery with decreased vision. On examination, there were anterior chamber cells and flare with hazy vitreous. What is the most likely cause and organism?

Which of the following lasers is used in refractive surgery?

In optic neuritis, which is true?

Which of the following investigations allows examination of all layers of the retina?

All of the following are done in the treatment of amblyopia, except:

Which of the following is seen in proliferative diabetic retinopathy?

Following a fungal corneal ulcer, a farmer underwent corneal transplant surgery. What is the preservative used for storing the donor corneal graft and the suture material used in the procedure?

Acute hemorrhagic conjunctivitis is caused by which of the following combinations?

Q10

Which of the following is the diagnosis based on the given eye movement abnormality image?

INI-CET 2025 - Ophthalmology INI-CET Practice Questions and MCQs

Question 1: Which of the following best defines blindness?

A. Visual acuity less than 3/60 in the better eye after best possible correction (Correct Answer)
B. Visual field less than 10 degrees from fixation in the better eye
C. Inability to perceive light in both eyes
D. Visual acuity less than 6/60 in the better eye

Explanation: ### **Explanation** The definition of **blindness** has evolved to align with international standards. According to the **WHO (ICD-11)** and the **National Programme for Control of Blindness (NPCB)** in India, blindness is defined as: * **Visual acuity (VA) < 3/60** (or less than 20/400) in the **better eye** with the best possible correction. * **OR** a **visual field** of less than **10 degrees** from the point of fixation in the better eye. #### **Analysis of Options:** * **Option A (Correct):** This matches the current NPCB and WHO criteria. It represents a shift from the older Indian definition (which was < 6/60) to ensure uniform global reporting. * **Option B (Incorrect):** While a visual field < 10 degrees is a criterion for blindness, the question asks for the "best definition" among the choices. Option A is the primary quantitative threshold used for VA. * **Option C (Incorrect):** This describes **Total Blindness** (No Perception of Light). While this is a form of blindness, the legal/clinical definition includes much higher levels of vision (up to 3/60) to ensure patients qualify for rehabilitation services. * **Option D (Incorrect):** VA < 6/60 was the **old NPCB definition** of blindness. It is now classified as **Severe Visual Impairment**. --- ### **High-Yield Clinical Pearls for INI-CET:** * **Visual Impairment Categories (WHO):** * **Mild:** VA < 6/12 to 6/18 * **Moderate:** VA < 6/18 to 6/60 * **Severe:** VA < 6/60 to 3/60 * **Blindness:** VA < 3/60 to No Light Perception (NLP) * **Economic Blindness:** VA < 6/60 (The level at which an individual cannot perform their profession). * **Social Blindness:** VA < 3/60 (The level at which an individual cannot navigate social environments independently). * **Manifestation:** In India, the most common cause of blindness is **Cataract**, followed by Refractive Errors and Glaucoma.

Question 2: A patient presented 2 weeks after cataract surgery with decreased vision. On examination, there were anterior chamber cells and flare with hazy vitreous. What is the most likely cause and organism?

A. Endophthalmitis with Staphylococcus
B. Endophthalmitis with Propionibacterium (Correct Answer)
C. Sympathetic ophthalmia
D. Toxic anterior segment syndrome

Explanation: ### **Explanation** The clinical presentation of decreased vision, anterior chamber cells/flare, and vitreous haze following cataract surgery is diagnostic of **Postoperative Endophthalmitis**. **1. Why Option B is Correct:** * **Timing:** The patient presents **2 weeks** post-surgery. While acute endophthalmitis typically occurs within 1–7 days, **delayed-onset (chronic/subacute)** endophthalmitis occurs weeks to months later. * **Organism:** ***Propionibacterium acnes*** is the most common cause of delayed-onset endophthalmitis. It is a slow-growing, Gram-positive anaerobic rod often sequestered within the capsular bag. A classic sign (though not mentioned here) is a **white plaque** on the posterior capsule. **2. Why Other Options are Incorrect:** * **Option A (Staphylococcus):** *Staphylococcus epidermidis* is the most common cause of **acute** postoperative endophthalmitis (typically presenting within the first week). *Staphylococcus aureus* causes a more virulent, rapid-onset infection. * **Option C (Sympathetic Ophthalmia):** This is a bilateral granulomatous panuveitis following penetrating trauma or surgery to one eye (the "exciting eye"). It usually presents with bilateral symptoms and specific features like Dalen-Fuchs nodules, which are absent here. * **Option D (Toxic Anterior Segment Syndrome - TASS):** TASS is a sterile inflammatory reaction caused by non-infectious substances (e.g., contaminants on instruments). Crucially, TASS presents **within 12–24 hours** and **does not involve the vitreous** (no vitreous haze). --- ### **High-Yield Clinical Pearls for INI-CET** * **Most common source of infection:** Patient’s own **conjunctival/eyelid flora**. * **Prophylaxis:** **Povidone-iodine (5%)** in the conjunctival sac is the most effective proven method to reduce endophthalmitis risk. * **Management (EVS Study):** * Vision **Hand Movements or better**: Intravitreal antibiotics (Vancomycin + Ceftazidime). * Vision **Light Perception only**: Immediate **Pars Plana Vitrectomy (PPV)**. * **TASS vs. Endophthalmitis:** TASS is early (hours) and involves only the anterior segment; Endophthalmitis is later (days/weeks) and involves the vitreous.

Question 3: Which of the following lasers is used in refractive surgery?

A. Argon
B. Diode
C. Nd:YAG
D. Excimer laser (Correct Answer)

Explanation: ### **Explanation: Lasers in Ophthalmology** The correct answer is **D. Excimer laser**. #### **1. Why Excimer Laser is Correct** The **Excimer laser** (Excited Dimer) uses a combination of a noble gas and a reactive gas (typically **Argon-Fluoride**) to produce a far-ultraviolet beam at a wavelength of **193 nm**. * **Mechanism:** It works via **photoablation**, where high-energy photons break intermolecular bonds in the corneal stroma without generating heat (cold ablation). * **Clinical Use:** This precise tissue removal allows for reshaping of the cornea to correct refractive errors in procedures like **LASIK** (Laser-Assisted In Situ Keratomileusis), **PRK** (Photorefractive Keratectomy), and **LASEK**. #### **2. Analysis of Incorrect Options** * **A. Argon Laser (514 nm):** Primarily used for **photocoagulation**. It is absorbed by melanin and hemoglobin, making it ideal for treating retinal tears, diabetic retinopathy (PRP), and performing trabeculoplasty in glaucoma. * **B. Diode Laser (810 nm):** Used for **photothermal** effects. Common applications include cyclophotocoagulation (for refractory glaucoma) and treatment of Retinopathy of Prematurity (ROP). * **C. Nd:YAG Laser (1064 nm):** A "solid-state" laser used for **photodisruption**. It creates a plasma shield to "cut" tissues. Key uses include **Posterior Capsulotomy** (for PCO) and **Peripheral Iridotomy** (for Angle-Closure Glaucoma). #### **3. High-Yield Clinical Pearls for INI-CET** * **Femtosecond Laser (1053 nm):** An infrared laser used in "Bladeless LASIK" to create the corneal flap and in **SMILE** (Small Incision Lenticule Extraction). * **Holmium Laser:** Used for **Laser Thermokeratoplasty (LTK)** to treat hyperopia. * **Double-frequency Nd:YAG (532 nm):** Also known as the **Green Laser**, commonly used for retinal photocoagulation (similar to Argon). * **Photoablation vs. Photodisruption:** Remember that Excimer = Ablation (surface reshaping), while Nd:YAG = Disruption (tissue cutting).

Question 4: In optic neuritis, which is true?

A. Unilateral vision loss with decreased color vision
B. Pain on eye movement only
C. Bilateral vision loss is common
D. Unilateral vision loss, pain on eye movement, and decreased color vision (Correct Answer)

Explanation: ### **Explanation: Optic Neuritis** **Optic Neuritis (ON)** is an inflammatory, demyelinating condition of the optic nerve, most commonly associated with **Multiple Sclerosis (MS)**. The correct answer (D) encompasses the classic clinical triad seen in acute presentations. #### **Why Option D is Correct:** The diagnosis of Optic Neuritis is primarily clinical, characterized by: * **Unilateral Vision Loss:** Usually sudden, reaching its peak within 1–2 weeks. It typically presents as a central or centrocecal scotoma. * **Pain on Eye Movement:** Present in over 90% of patients. This occurs because the origins of the superior and medial recti are closely attached to the sheath of the optic nerve at the orbital apex. * **Decreased Color Vision (Dyschromatopsia):** Often more severe than the degree of visual acuity loss. Patients frequently report that colors (especially red) appear "washed out" (**Red Desaturation**). #### **Why Other Options are Incorrect:** * **Option A:** While true, it is incomplete. Pain on eye movement is a hallmark diagnostic feature that distinguishes ON from other causes of sudden vision loss. * **Option B:** Pain is a symptom, but the primary complaint bringing the patient to the clinic is the functional deficit (vision and color loss). * **Option C:** In adults, Optic Neuritis is **characteristically unilateral**. Bilateral involvement is more common in children or specific conditions like Neuromyelitis Optica (NMO). --- ### **High-Yield Clinical Pearls for INI-CET:** * **Marcus-Gunn Pupil:** A **Relative Afferent Pupillary Defect (RAPD)** is the most important objective clinical sign. * **Pulfrich Phenomenon:** Objects moving in a straight line appear to move in a curved elliptical path. * **Uhthoff’s Phenomenon:** Temporary worsening of vision when body temperature rises (e.g., after a hot shower or exercise). * **Fundus Findings:** In **Retrobulbar Neuritis** (most common in adults), the disc looks **normal** initially ("The patient sees nothing, and the doctor sees nothing"). * **Treatment:** The **ONTT (Optic Neuritis Treatment Trial)** recommends **IV Methylprednisolone** (1g/day for 3 days) to speed up recovery. *Note: Oral steroids alone are contraindicated as they increase the rate of recurrence.*

Question 5: Which of the following investigations allows examination of all layers of the retina?

A. OCT (Correct Answer)
B. B-scan ultrasonography
C. Perimetry
D. Fundus fluorescein angiography

Explanation: ### **Explanation** **Optical Coherence Tomography (OCT)** is the correct answer because it functions as an **"optical biopsy"** of the retina. It uses low-coherence interferometry (near-infrared light) to produce high-resolution, **cross-sectional images**. This allows clinicians to visualize and measure all **ten layers of the retina** individually, from the Internal Limiting Membrane (ILM) to the Retinal Pigment Epithelium (RPE) and even the underlying choroid. #### **Why the other options are incorrect:** * **B-scan Ultrasonography:** This is a two-dimensional acoustic imaging technique. While excellent for detecting gross structural changes (like retinal detachment or intraocular tumors) when the ocular media is opaque (e.g., dense cataract or vitreous hemorrhage), it lacks the resolution to distinguish individual retinal layers. * **Perimetry:** This is a **functional** test (not structural) used to map the visual field. It identifies blind spots (scotomas) but cannot visualize the anatomical layers of the retina. * **Fundus Fluorescein Angiography (FFA):** This is a dynamic study of the **retinal vasculature**. While it is the gold standard for detecting leaks, neovascularization, and capillary non-perfusion, it provides a "top-down" view and cannot differentiate the depth or thickness of specific retinal layers. --- ### **High-Yield Clinical Pearls for INI-CET:** * **OCT Principle:** Based on **Michelson Interferometry**. * **Resolution:** OCT has a resolution of **5–10 microns**, which is significantly higher than B-scan (~150 microns). * **Key Indications:** Best for diagnosing **Macular Hole**, **Epiretinal Membrane**, and **Cystoid Macular Edema (CME)**. * **Inverted Image:** In OCT, the RPE is the most hyper-reflective (brightest) outer band. * **Swept-Source OCT (SS-OCT):** The newest generation that uses longer wavelengths to penetrate deeper into the **choroid**.

Question 6: All of the following are done in the treatment of amblyopia, except:

A. Refractive error correction
B. Strabismus surgery (Correct Answer)
C. Video game therapy
D. Patching (occlusion therapy)

Explanation: ### **Explanation: Treatment of Amblyopia** **Amblyopia** (lazy eye) is a functional reduction in visual acuity caused by abnormal visual experience early in life. The core principle of treatment is to **provide a clear retinal image** and **force the use of the amblyopic eye**. **Why Strabismus Surgery is the Correct Answer (The "Except"):** While strabismus is a major cause of amblyopia, **strabismus surgery is NOT a treatment for amblyopia itself.** Surgery corrects the ocular alignment (cosmetic or functional), but it does not improve the neural visual deficit. In fact, surgery is typically deferred until amblyopia is treated or stabilized, as a "lazy" eye has a higher risk of losing alignment post-operatively. **Analysis of Other Options:** * **Refractive error correction (A):** This is the **first step** in management. Correcting anisometropia or high refractive errors ensures a focused image reaches the retina, which can alone resolve amblyopia in some cases. * **Video game therapy (C):** This represents **Dichoptic therapy** or active vision training. It encourages binocular interaction and is an emerging, effective adjunct to traditional patching, especially in older children. * **Patching (D):** The **gold standard** of treatment. By occluding the "better" eye, the brain is forced to process signals from the amblyopic eye, strengthening the neural pathways. --- ### **High-Yield Clinical Pearls for NEET-PG/INI-CET:** * **Critical Period:** Amblyopia treatment is most effective before age **7–9 years**, though some plasticity remains until the mid-teens. * **Penalization:** If a child is non-compliant with patching, **Atropine 1% drops** are used in the "good" eye to blur near vision, forcing the use of the amblyopic eye. * **Sequence of Management:** 1. Clear the visual axis (e.g., cataract surgery). 2. Correct refractive errors (Glasses). 3. Occlusion/Penalization. 4. **Last step:** Strabismus surgery (only after maximal visual acuity is achieved).

Question 7: Which of the following is seen in proliferative diabetic retinopathy?

A. Tractional retinal detachment (Correct Answer)
B. No retinal detachment
C. Exudative retinal detachment
D. Rhegmatogenous retinal detachment

Explanation: ### **Explanation: Diabetic Retinopathy and Retinal Detachment** The hallmark of **Proliferative Diabetic Retinopathy (PDR)** is **Neovascularization** (growth of new, fragile vessels) in response to chronic retinal ischemia. #### **Why Tractional Retinal Detachment (TRD) is Correct:** In PDR, neovascularization is accompanied by the proliferation of **fibrovascular membranes**. These membranes grow along the posterior hyaloid face and into the vitreous cavity. Over time, these fibrous bands undergo **contraction**, exerting mechanical "pull" or traction on the sensory retina. This pulls the neurosensory retina away from the underlying Retinal Pigment Epithelium (RPE), leading to **Tractional Retinal Detachment**. * **Key Feature:** TRD in PDR typically has a **concave configuration** and is non-rhegmatogenous (no hole/tear initially). #### **Why Other Options are Incorrect:** * **Exudative Retinal Detachment:** This occurs due to fluid leakage from the choroid (e.g., tumors, VKH syndrome, or inflammatory conditions). While PDR involves leakage (edema), it does not typically cause a full exudative detachment. * **Rhegmatogenous Retinal Detachment (RRD):** This is caused by a **full-thickness retinal break** (hole/tear) allowing liquefied vitreous to enter the subretinal space. While a TRD can occasionally progress to a "Combined" detachment if a tear forms, the primary mechanism in PDR is tractional. * **No Retinal Detachment:** This describes Non-Proliferative Diabetic Retinopathy (NPDR) or very early PDR before fibrous proliferation occurs. --- ### **High-Yield Clinical Pearls for INI-CET:** * **Management of TRD:** The gold standard treatment for a tractional detachment involving the macula is **Pars Plana Vitrectomy (PPV)** with membrane peeling. * **Indications for PRP:** Pan-retinal photocoagulation is indicated in **High-Risk PDR** to regress neovascularization. * **Vitreous Hemorrhage:** The most common cause of sudden, painless vision loss in a long-standing diabetic is vitreous hemorrhage (secondary to PDR). * **NVI:** Neovascularization of the Iris (Rubeosis Iridis) can lead to **Neovascular Glaucoma**, a dreaded complication of PDR.

Question 8: Following a fungal corneal ulcer, a farmer underwent corneal transplant surgery. What is the preservative used for storing the donor corneal graft and the suture material used in the procedure?

A. Polyethylene glycol, Nylon
B. Moist chamber, Vicryl
C. Ethanol, Silk
D. McCarey-Kaufman, Nylon (Correct Answer)

Explanation: ### **Explanation** The correct answer is **D. McCarey-Kaufman, Nylon.** #### **1. Why the Correct Answer is Right** * **Donor Storage:** The **McCarey-Kaufman (MK) medium** is a classic short-term storage solution (up to **4 days** at 4°C). It consists of Tissue Culture Medium 199 and **Dextran**, which acts as an osmotic agent to prevent corneal edema. In modern practice, Optisol-GS is more common, but MK medium remains a high-yield exam answer for short-term storage. * **Suture Material:** **10-0 Monofilament Nylon** is the gold standard for **Penetrating Keratoplasty (PKP)**. It is non-absorbable, has high tensile strength, and produces minimal tissue reaction, which is crucial for maintaining a clear graft-host interface. #### **2. Why Other Options are Wrong** * **Option A:** **Polyethylene glycol** is used in some pharmaceutical formulations but is not a primary corneal storage medium. * **Option B:** **Moist chamber** storage (whole globe in a sterile jar) is only viable for **under 24 hours**. **Vicryl** (Polyglactin) is an absorbable suture; its rapid degradation and high inflammatory profile make it unsuitable for corneal grafts. * **Option C:** **Ethanol** is used to preserve tissue for **Gundersen Flaps** or certain tectonic grafts, but it kills the corneal endothelium, making it useless for optical transplants. **Silk** is multifilament and highly inflammatory, leading to vascularization and graft rejection. #### **3. Clinical Pearls for INI-CET** * **Storage Durations:** * **Short-term (4 days):** MK Medium. * **Intermediate-term (up to 14 days):** Optisol-GS (contains Chondroitin sulfate + Gentamicin/Streptomycin). * **Long-term (months):** Organ Culture (31°C) or Cryopreservation. * **The Endothelium:** The primary goal of storage media is to maintain **endothelial cell viability**, as these cells do not regenerate. * **Suture Removal:** In PKP, sutures are typically left for **6–12 months** due to the slow healing of the avascular cornea.

Question 9: Acute hemorrhagic conjunctivitis is caused by which of the following combinations?

A. Coxsackie A and Enterovirus 70 (Correct Answer)
B. Coxsackie B and Enterovirus 70
C. Coxsackie A, Coxsackie B and Enterovirus 70
D. Coxsackie A and Coxsackie B

Explanation: ### **Explanation: Acute Hemorrhagic Conjunctivitis (AHC)** **Acute Hemorrhagic Conjunctivitis (AHC)** is a highly contagious, self-limiting viral infection characterized by rapid onset, lid edema, and pathognomonic **subconjunctival hemorrhages**. #### **1. Why Option A is Correct** The primary etiological agents for AHC are **Enterovirus 70 (EV-70)** and **Coxsackievirus A24 (CA24)** variant. These are small RNA viruses belonging to the *Picornaviridae* family. * **Enterovirus 70** was the first identified cause during the 1969 pandemic. * **Coxsackie A24** is responsible for several subsequent large-scale outbreaks worldwide. #### **2. Why Other Options are Incorrect** * **Options B, C, and D:** These include **Coxsackie B**. While Coxsackievirus B is a common cause of myocarditis, pleurodynia (Bornholm disease), and meningitis, it is **not** a recognized cause of acute hemorrhagic conjunctivitis. The ocular tropism is specific to the **A24 variant** of Coxsackie A. --- ### **High-Yield Clinical Pearls for NEET-PG / INI-CET** * **Incubation Period:** Extremely short, typically **12 to 48 hours**. * **Clinical Hallmark:** Multiple **petechial hemorrhages** on the bulbar conjunctiva that may coalesce to form a large subconjunctival hemorrhage. * **Neurological Association:** A rare but serious complication of **Enterovirus 70** is a **polio-like paralysis** (radiculomyelitis), which can occur several weeks after the conjunctivitis resolves. * **Differential Diagnosis:** * **Epidemic Keratoconjunctivitis (EKC):** Caused by **Adenovirus (Serotypes 8, 19, 37)**. It presents with prominent pseudomembranes and corneal involvement (subepithelial infiltrates) but less frequent hemorrhage compared to AHC. * **Management:** Supportive treatment only (cold compresses, lubricants); antibiotics are used only to prevent secondary bacterial infection.

Question 10: Which of the following is the diagnosis based on the given eye movement abnormality image?

A. 3rd nerve palsy
B. Internuclear ophthalmoplegia (Correct Answer)
C. 6th nerve palsy
D. Horizontal gaze palsy

Explanation: **Internuclear ophthalmoplegia** - This diagnosis is indicated by the failure of the right eye to **adduct** (move inwards) when looking to the left, which is a hallmark sign. This specific defect is caused by a lesion in the **Medial Longitudinal Fasciculus (MLF)** on the same side as the adduction failure. - Another key feature shown is **nystagmus** in the contralateral (left) eye during **abduction** (outward movement). This combination of ipsilateral adduction failure and contralateral abducting nystagmus is classic for INO. *3rd nerve palsy* - A 3rd nerve palsy would present with the affected eye positioned 'down and out' due to unopposed action of the superior oblique and lateral rectus muscles. It also typically involves **ptosis** and a **dilated pupil**. - In the given image, the vertical movements and pupillary function are not depicted as abnormal, and the primary issue is with horizontal conjugate gaze, not the multiple deficits seen in 3rd nerve palsy. *6th nerve palsy* - This condition results in the inability to **abduct** the eye (move it outwards) due to paralysis of the **lateral rectus muscle**. The patient would complain of horizontal diplopia, worse on gaze towards the affected side. - The image shows that both eyes are capable of abduction. The defect is clearly in adduction of the right eye. *Horizontal gaze palsy* - This involves the inability of **both eyes** to move in one horizontal direction. It is caused by a lesion in the pontine gaze center, the **Paramedian Pontine Reticular Formation (PPRF)**. - In this case, the left eye successfully moves to the left, and both eyes can move to the right, ruling out a complete gaze palsy to either side.