Diseases of the Sclera Practice Questions

Q: Scleritis is commonly seen with which of the following conditions?

Rheumatoid arthritis. **Explanation:** **1. Why Rheumatoid Arthritis (RA) is the Correct Answer:** Scleritis is a severe, vision-threatening inflammatory condition of the deep sclera. It is strongly associated with systemic autoimmune diseases, which are present in approximately 50% of patients. **Rheumatoid Arthritis (RA)** is the **most common** systemic association, accounting for nearly 18–33% of all scleritis cases. The underlying pathophysiology involves a Type III (immune-complex mediated) and Type IV (delayed-type) hypersensitivity reaction leading to vasculitis of the deep episcleral plexus. **2. Analysis of Incorrect Options:** * **Reiter’s Syndrome (Reactive Arthritis) & Ankylosing Spondylitis (Options A & C):** These are Seronegative Spondyloarthropathies (HLA-B27 associated). While they are classic causes of **Acute Anterior Uveitis** and occasionally episcleritis, they are rarely associated with true scleritis. * **Wegener’s Granulomatosis (Granulomatosis with Polyangiitis) (Option D):** This is a significant cause of **necrotizing scleritis**, which is the most severe form. However, in terms of overall prevalence and frequency in clinical practice, RA remains the more common association compared to Wegener’s. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of 50":** 50% of scleritis patients have an underlying systemic disease; 50% of those have RA. * **Scleromalacia Perforans:** This is a specific type of necrotizing scleritis without inflammation, seen almost exclusively in elderly women with long-standing RA. * **Clinical Distinction:** Unlike episcleritis, the pain in scleritis is severe, boring in nature, radiates to the temple/jaw, and the redness **does not blanch** with 10% phenylephrine drops. * **Investigation:** If Wegener's is suspected, the most specific test is **c-ANCA**. For RA, **Rheumatoid Factor** and **Anti-CCP** are key.

Q: Blue coloured sclera is frequently associated with which of the following conditions?

Osteogenesis imperfecta. **Explanation:** The blue appearance of the sclera is not due to a blue pigment, but rather due to **thinning of the scleral collagen**, which allows the underlying dark-pigmented **uveal tissue** (choroid) to shine through. **1. Why Osteogenesis Imperfecta (OI) is correct:** OI is the most classic association with blue sclera (seen in ~90% of Type I cases). It is a genetic disorder caused by a deficiency in **Type I collagen** synthesis. Since the sclera is primarily composed of Type I collagen, the defect leads to an abnormally thin scleral coat, making it translucent. **2. Analysis of Incorrect Options:** * **Ehlers-Danlos Syndrome (EDS):** While EDS (specifically Type VI, the Kyphoscoliotic type) can occasionally present with blue sclera and scleral fragility, it is much more frequently associated with **keratoconus, keratoglobus, and retinal detachment**. OI remains the "textbook" primary association for blue sclera. * **Chondrodysplasia:** This refers to a group of skeletal disorders affecting cartilage (Type II collagen). It does not typically involve the Type I collagen-rich sclera. * **Alport Syndrome:** This is a defect in **Type IV collagen** (basement membranes). Ocular hallmarks include **anterior lenticonus** and "dot-and-fleck" retinopathy, not blue sclera. **NEET-PG High-Yield Pearls:** * **Differential Diagnosis of Blue Sclera:** Osteogenesis imperfecta, Ehlers-Danlos syndrome, Marfan syndrome, Pseudoxanthoma elasticum, and Buphthalmos (due to stretching in congenital glaucoma). * **Drug-induced Blue Sclera:** Long-term use of **Minocycline**. * **OI Triad (Van der Hoeve sequence):** Blue sclera, Fragile bones (multiple fractures), and Otosclerosis (conductive deafness).

Q: Ciliary staphyloma affects the ciliary zone up to how many mm behind the limbus?

8. **Explanation:** A **staphyloma** is a localized bulging of the weak outer coat of the eyeball (sclera or cornea) lined by uveal tissue. In **Ciliary Staphyloma**, the sclera in the ciliary zone becomes thin and atrophic, allowing the underlying ciliary body to bulge through, giving it a characteristic bluish-black appearance. **Why 8 mm is correct:** The ciliary zone of the sclera extends from the limbus to approximately **8 mm behind the limbus**. This area corresponds to the location of the ciliary body. Therefore, any ectasia occurring within this specific anatomical boundary is classified as a ciliary staphyloma. It is most commonly caused by chronic endophthalmitis, scleritis, or absolute glaucoma. **Analysis of Incorrect Options:** * **4 mm:** This distance corresponds roughly to the width of the *pars plicata* of the ciliary body but does not encompass the entire ciliary zone (which includes the *pars plana*). * **6 mm:** While some anatomical landmarks exist here, it is an incomplete measurement for the posterior extent of the ciliary body. * **10 mm:** This distance extends beyond the ciliary body into the *equatorial* region of the eye. Bulging occurring at the equator (where the vortex veins exit) is termed **Equatorial Staphyloma**. **High-Yield NEET-PG Pearls:** 1. **Intercalary Staphyloma:** Occurs between the limbus and the anterior limit of the ciliary body (up to 2 mm from the limbus). 2. **Posterior Staphyloma:** Occurs at the posterior pole; most commonly associated with **High Myopia**. 3. **Appearance:** The bluish color of a staphyloma is not due to pigment in the sclera, but due to the **pigmented uveal tissue** showing through the thinned scleral fibers. 4. **Commonest cause:** For anterior types, it is usually secondary to uncontrolled **Absolute Glaucoma**.

Q: Which of the following is NOT true about scleritis?

It is a painless condition.. **Explanation:** Scleritis is a severe, vision-threatening inflammatory condition of the sclera. The hallmark clinical feature that distinguishes it from episcleritis is **intense, deep, boring pain** that often radiates to the forehead, brow, or jaw. 1. **Why Option A is the correct answer (False statement):** Scleritis is **not** a painless condition. In fact, the presence of severe pain is the most important diagnostic clue. It is caused by the activation of sensory trigeminal nerve fibers within the sclera. If a patient presents with a red eye that is painless or only mildly itchy, the diagnosis is more likely to be conjunctivitis or episcleritis. 2. **Why other options are incorrect (True statements):** * **Option B:** Secondary **glaucoma** can occur due to trabeculitis, peripheral anterior synechiae (PAS), or steroid-induced ocular hypertension. * **Option C:** **Necrotizing scleritis** is indeed the most severe form, often associated with systemic autoimmune diseases (like Rheumatoid Arthritis) and can lead to scleral thinning (scleromalacia perforans) and globe perforation. * **Option D:** The pain of anterior scleritis is characteristically **worse at night**, often waking the patient from sleep, and is exacerbated by eye movements. **High-Yield Clinical Pearls for NEET-PG:** * **Phenylephrine Test:** 10% Phenylephrine drops will blanch the superficial vessels in episcleritis but **will NOT blanch** the deep, violaceous (bluish-red) vessels of scleritis. * **Systemic Association:** Approximately 50% of scleritis patients have an underlying systemic disease, most commonly **Rheumatoid Arthritis**. * **Scleromalacia Perforans:** A specific type of necrotizing scleritis that occurs in elderly women with long-standing RA; it is uniquely **painless**.

Q: Blue sclera is seen in which of the following conditions?

Osteogenesis imperfecta. **Explanation:** The color of the sclera is normally white due to the dense, opaque arrangement of collagen fibers. A **blue sclera** occurs when the sclera becomes pathologically thin or its collagen structure is altered, allowing the underlying dark blue **uveal tissue** (choroid) to show through. **1. Why Osteogenesis Imperfecta (OI) is correct:** OI is a genetic disorder characterized by a defect in **Type I collagen** synthesis. Because the sclera is primarily composed of Type I collagen, the deficiency leads to extreme thinning. This transparency makes the sclera appear distinctively blue. It is a classic clinical sign of OI Type I. **2. Analysis of Incorrect Options:** * **Alkaptonuria:** This metabolic disorder leads to the accumulation of homogentisic acid, causing **ochronosis**. In the eye, this manifests as slate-grey or **brownish-black pigmentation** (not blue), typically near the insertions of the recti muscles. * **Down Syndrome:** Ocular features commonly include Brushfield spots (iris speckling), epicanthal folds, and keratoconus, but blue sclera is not a characteristic feature. * **Kawasaki Syndrome:** This is a systemic vasculitis characterized by **bilateral non-exudative conjunctival injection** (red eyes), not scleral thinning or discoloration. **3. High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Blue Sclera:** * *Congenital:* Osteogenesis imperfecta, Ehlers-Danlos syndrome (Type VI), Marfan syndrome, Buphthalmos (thinning due to globe enlargement). * *Acquired:* Scleromalacia perforans (Rheumatoid Arthritis), long-term topical steroid use (thinning), and Nevus of Ota (pigmentation). * **Van der Hoeve Syndrome:** A triad of Osteogenesis imperfecta, Blue sclera, and Otosclerosis (hearing loss). * **Alkaptonuria Key Point:** Look for "coke-colored urine" on standing and "ear cartilage pigmentation" in the clinical stem.

Q: All are causes of the presentation shown below except:

Buphthalmos. ***Buphthalmos*** - **Buphthalmos** refers to congenital glaucoma causing **enlargement of the eyeball** with increased corneal diameter (>12 mm). - Classical features include **corneal edema**, **Haab's striae**, and **increased intraocular pressure**. - Buphthalmos does **NOT cause blue sclera**. The sclera in congenital glaucoma is typically normal in color, though the enlarged globe and corneal changes are prominent. - This is the correct answer as it does not cause the presentation shown (blue sclera). *Marfan syndrome* - **Marfan syndrome** is a genetic disorder affecting **fibrillin-1**, leading to connective tissue abnormalities. - Causes **scleral thinning** resulting in **blue sclera** due to visualization of underlying choroidal pigment. - Other ocular features include **ectopia lentis** (upward lens subluxation), **myopia**, and **retinal detachment**. - Systemic features: aortic root dilation, tall stature, arachnodactyly, pectus deformities. *Ehlers-Danlos syndrome* - A group of inherited connective tissue disorders with **collagen defects** (various types affecting different collagen types). - Causes **blue sclera** due to **scleral thinning** and transparency. - Other features include **skin hyperextensibility**, **joint hypermobility**, **tissue fragility**, and easy bruising. - Ocular complications: keratoconus, retinal detachment, globe rupture with minimal trauma. *High hypermetropia* - While **high hypermetropia** primarily refers to a refractive error with light focusing behind the retina, in the context of this question it likely refers to conditions with **nanophthalmos** (abnormally small eye). - Some forms of **microphthalmos with nanophthalmos** can have associated **scleral thickening or abnormalities** that may give a bluish appearance in rare syndromic cases. - However, this association is tenuous compared to the clear connective tissue disorders listed above.

Q: A 25 -year-old patient presents with localized redness in right eye as shown below. On instillation of 10% phenylephrine there is quick blanching of the vessels. What is the diagnosis?

Nodular episcleritis. **Correct: Nodular episcleritis** - The image shows **localized redness** and congestion of the episcleral vessels, which **blanch with 10% phenylephrine**, indicating superficial involvement of the episclera. - This presentation, particularly the blanching with phenylephrine, is classic for **episcleritis**, and the localized, raised appearance suggests a nodular form. - The **phenylephrine blanching test** is the key diagnostic feature that distinguishes episcleritis from deeper scleral inflammation. *Incorrect: Angular conjunctivitis* - This typically presents with **redness and irritation** localized to the **canthi** (corners) of the eye, often associated with crusty discharge. - While it causes redness, it doesn't usually form a distinct nodule and its vessels generally do not respond as dramatically to phenylephrine as episcleral vessels. *Incorrect: Nodular scleritis* - Scleritis involves the **deeper scleral layer**, causing **severe pain** and often a **violaceous hue** to the redness, which **does not blanch with 10% phenylephrine**. - This is the most important differential diagnosis; the positive phenylephrine blanching test rules out scleritis. - It is a more serious condition than episcleritis and typically requires systemic treatment. *Incorrect: Scleromalacia perforans* - This is a **rare, severe form of necrotizing scleritis without inflammation**, predominantly seen in patients with **long-standing rheumatoid arthritis**. - It involves gradual thinning and disappearance of scleral tissue, leading to exposure of the underlying uvea, which is not consistent with the acute, localized redness shown in the image.

Q: A patient presents with a nodular swelling near the limbus, which does not blanch with topical vasoconstrictors and recurs after treatment. Based on the image and clinical presentation, what is the most probable diagnosis?

Scleritis with rheumatoid arthritis. ***Scleritis with rheumatoid arthritis*** - The image shows **deep, violaceous conjunctival injection** with surrounding edema and a nodular appearance near the limbus, consistent with **nodular scleritis**. Scleritis is inflammation of the sclera, often characterized by severe pain and association with systemic autoimmune diseases like **rheumatoid arthritis**, which can cause destructive lesions and recurrence. - The characteristic **deep vessel engorgement that does not blanch with phenylephrine** and the history of recurrence further support scleritis. *Episcleritis with rheumatoid arthritis* - Episcleritis presents with a **more superficial, bright red injection** involving the episclera, which generally **blanches with topical phenylephrine** and is less painful than scleritis. - While episcleritis can be associated with rheumatoid arthritis, the clinical features described (nodular swelling, deep injection) are more typical of scleritis. *Pinguecula* - A pinguecula is a **yellowish patch or bump** on the conjunctiva, typically on the nasal side of the eye, that is **not inflamed** unless irritated. - It consists of **degenerated collagen fibers** and elastic tissue, and does not present with the diffuse, deep vascular injection seen in the image. *Dry eye* - Dry eye is characterized by **ocular dryness, irritation, and sometimes a foreign body sensation**, but it typically causes **diffuse conjunctival hyperemia** rather than a localized, nodular, deep inflammation with surrounding edema as shown. - While dry eye can be associated with autoimmune diseases, its appearance is not consistent with the depicted nodular lesion.

Q: The given image shows blanching of vascularity after the phenylephrine use. What is the likely diagnosis?

Nodular episcleritis. ***Nodular episcleritis*** - The image shows a **nodule** on the episclera with surrounding injection that significantly **blanches** after phenylephrine application, which is characteristic of episcleritis. - Episcleritis involves the **superficial episcleral vessels** which respond to topical vasoconstrictors like **phenylephrine (2.5% or 10%)**, leading to blanching. - This is a benign, self-limiting condition that typically presents with **mild discomfort** rather than severe pain. - The **phenylephrine test** is positive in episcleritis (vessels blanch) and helps differentiate it from scleritis. *Nodular scleritis* - Scleritis involves the **deep scleral vessels** which do NOT blanch with phenylephrine application. - Presents with **severe boring pain** that radiates to the forehead, jaw, and face, often waking the patient at night. - The condition is associated with **systemic autoimmune diseases** in 50% of cases (rheumatoid arthritis, SLE, Wegener's granulomatosis). - Requires **systemic treatment** with NSAIDs or immunosuppressives, unlike episcleritis which is self-limiting. *Conjunctivitis* - Presents with **diffuse conjunctival injection** rather than a localized nodule. - Characterized by **discharge** (purulent, mucopurulent, or watery) and typically no pain. - Vessels blanch with phenylephrine, but the clinical presentation lacks the nodular appearance seen in episcleritis. - Associated with symptoms like **itching, foreign body sensation**, and eyelid matting in morning. *Anterior uveitis* - Presents with **circumcorneal (perilimbal) injection** rather than episcleral nodules. - Characterized by **photophobia, blurred vision**, and cells in the anterior chamber on slit-lamp examination. - The injection pattern is **deep ciliary injection** which does not blanch with phenylephrine. - Associated with **hypopyon** in severe cases and requires urgent treatment to prevent complications.

Q: Posterior staphyloma is seen in -

Degenerative high axial myopia. ***Degenerative high axial myopia*** - **Posterior staphyloma** is a hallmark feature of **pathological** or **degenerative high axial myopia**, characterized by an outpouching of the posterior sclera. - This condition arises from excessive **axial elongation** of the eyeball, leading to thinning and weakening of the sclera at the posterior pole. *Corneal Ulcer* - A **corneal ulcer** is an open sore on the cornea, often caused by infection, and primarily affects the **anterior segment** of the eye. - It does not involve changes in the scleral structure or lead to **posterior staphyloma**. *Chronic Uncontrolled glaucoma* - **Chronic uncontrolled glaucoma** is characterized by progressive optic nerve damage and visual field loss, typically due to elevated intraocular pressure. - While it can lead to cupping of the optic disc, it does not directly cause **posterior staphyloma**. *Complication of cataract surgery* - Complications of **cataract surgery** include conditions like posterior capsule opacification, cystoid macular edema, or retinal detachment. - These complications do not involve the development of a **posterior staphyloma**.

Question 1

Scleritis is commonly seen with which of the following conditions?

Accepted Answer

Rheumatoid arthritis

Answer

Reiter's syndrome

Answer

Ankylosing spondylitis

Answer

Wegener's granulomatosis

Question 2

Blue coloured sclera is frequently associated with which of the following conditions?

Accepted Answer

Osteogenesis imperfecta

Answer

Ehlers-Danlos syndrome

Answer

Chondrodysplasia

Answer

Alport syndrome

Question 3

Ciliary staphyloma affects the ciliary zone up to how many mm behind the limbus?

Accepted Answer

8

Answer

4

Answer

6

Answer

10

Question 4

Which of the following is NOT true about scleritis?

Accepted Answer

It is a painless condition.

Answer

Glaucoma may occur.

Answer

Necrotising scleritis is a more severe and destructive form.

Answer

Anterior scleritis pain often worsens at night.

Question 5

Blue sclera is seen in which of the following conditions?

Accepted Answer

Osteogenesis imperfecta

Answer

Alkaptonuria

Answer

Down syndrome

Answer

Kawasaki syndrome

Question 6

All are causes of the presentation shown below except:

Accepted Answer

Buphthalmos

Answer

Marfan syndrome

Answer

Ehlers-Danlos syndrome

Answer

High hypermetropia

Question 7

A 25 -year-old patient presents with localized redness in right eye as shown below. On instillation of 10% phenylephrine there is quick blanching of the vessels. What is the diagnosis?

Accepted Answer

Nodular episcleritis

Answer

Angular conjunctivitis

Answer

Nodular scleritis

Answer

Scleromalacia perforans

Question 8

A patient presents with a nodular swelling near the limbus, which does not blanch with topical vasoconstrictors and recurs after treatment. Based on the image and clinical presentation, what is the most probable diagnosis?

Accepted Answer

Scleritis with rheumatoid arthritis

Answer

Episcleritis with rheumatoid arthritis

Answer

Pinguecula

Answer

Dry eye

Question 9

The given image shows blanching of vascularity after the phenylephrine use. What is the likely diagnosis?

Accepted Answer

Nodular episcleritis

Answer

Nodular scleritis

Answer

Conjunctivitis

Answer

Anterior uveitis

Question 10

Posterior staphyloma is seen in -

Accepted Answer

Degenerative high axial myopia

Answer

Corneal Ulcer

Answer

Chronic Uncontrolled glaucoma

Answer

Complication of cataract surgery

Diseases of the Sclera — MCQs

Diseases of the Sclera — MCQs

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