Diseases of the Sclera Practice Questions

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: 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: Ciliary staphyloma occurs due to all of the following except:

Episcleritis. ***Episcleritis*** - **Episcleritis** is a benign, self-limiting inflammation of the episclera, which is a superficial layer of connective tissue, and does not lead to **scleral thinning** or ectasia. - Therefore, it does not cause **ciliary staphyloma**, which is a bulging of the sclera in the ciliary body region. *Scleritis* - **Scleritis** is a severe, chronic inflammatory disease affecting the sclera, often leading to **scleral thinning** and weakening. - This thinning can predispose to the formation of a **ciliary staphyloma**, especially if the inflammation is localized in the ciliary region. *Absolute glaucoma* - **Absolute glaucoma** is a severe form of glaucoma characterized by persistently high **intraocular pressure (IOP)**, leading to total vision loss and often significant **scleral thinning** due to chronic pressure. - The elevated IOP can cause stretching and thinning of the sclera, particularly in weakened areas like the **ciliary body**, resulting in a **ciliary staphyloma**. *Perforating injury* - A **perforating injury** to the globe can directly weaken the **scleral wall**, especially if it occurs near the **ciliary body**. - Subsequent healing with scar tissue, often under intraocular pressure, can lead to ectasia and the formation of a **ciliary staphyloma**.

Q: Most common type of scleritis among the following is

Non-necrotizing. ***Non-necrotizing*** - This category, particularly **diffuse non-necrotizing scleritis**, is the most frequently encountered type. - It is often characterized by widespread inflammation of the sclera without tissue loss. *Necrotizing* - This is a severe form of scleritis associated with significant **tissue destruction** and a high risk of vision loss. - While serious, it is thankfully much rarer than the non-necrotizing forms. *Granulomatous* - This term describes a **histopathological feature** of inflammation rather than a distinct clinical type of scleritis. - Granulomatous inflammation can be seen in various forms of scleritis but is not a primary classification of its most common presentation. *Posterior* - **Posterior scleritis** specifically involves inflammation of the sclera behind the equator of the globe. - It is less common than anterior scleritis and can present with different symptoms such as vision loss or pain with eye movement.

Q: The most common variety of scleritis is:

Non-necrotizing anterior diffuse. ***Non-necrotizing anterior diffuse*** - This is the **most common type of scleritis**, characterized by widespread inflammation of the anterior sclera without tissue loss. - It presents with **redness**, **pain**, and **tenderness** over a large area of the sclera. *Non-necrotizing anterior nodular* - This type features **localized, tender nodules** on the sclera, which are less common than the diffuse form. - While also non-necrotizing and anterior, the nodular presentation is not the most frequent variety. *Anterior necrotizing without inflammation* - This severe form, known as **scleromalacia perforans**, is rare and typically seen in patients with long-standing rheumatoid arthritis. - It is characterized by **scleral thinning and necrosis** without significant inflammatory signs. *Anterior necrotizing with inflammation* - This is a **severe and destructive form** of scleritis associated with significant pain and potential vision loss. - While serious, it is rare compared to diffuse non-necrotizing anterior scleritis.

Q: Blue sclera is seen in all of the following conditions except:

Keratoconus. ***Keratoconus*** - Keratoconus is a progressive eye disease in which the normally round cornea thins and begins to bulge into a cone-like shape, leading to **vision distortion**. - Blue sclera is **not a feature** of keratoconus. This is a **corneal condition** that does not affect the sclera. - Blue sclera, seen in the other conditions listed, occurs due to thinning of the sclera, making the underlying choroidal pigment visible. *Marfan's syndrome* - Patients with Marfan's syndrome can have blue sclera due to the **thinning of collagen** in the scleral tissue, allowing the underlying choroid to show through. - This connective tissue disorder affects multiple body systems, including the skeletal, cardiovascular, and ocular systems, with features like **arachnodactyly** and **aortic root dilation**. *Osteogenesis imperfecta* - Often referred to as **brittle bone disease**, osteogenesis imperfecta is characterized by defective **type I collagen synthesis**, which also affects the sclera. - The sclera becomes thin and translucent, revealing the underlying choroidal pigment, thus appearing **blue**. *Rheumatoid arthritis* - In rheumatoid arthritis, particularly with severe or long-standing disease, the sclera can become thinned due to **scleritis** or **scleromalacia perforans**. - This thinning can lead to a **blue discoloration** of the sclera, making the underlying choroid visible.

Q: Most common type of scleritis is

Anterior. ***Anterior*** - **Anterior scleritis** accounts for approximately **98%** of all scleritis cases, making it the most common type. - It involves inflammation of the sclera anterior to the **equator of the globe**, visible on external examination. - Anterior scleritis is further subdivided into **diffuse, nodular,** and **necrotizing** forms based on clinical presentation and severity. *Diffuse anterior* - **Diffuse anterior scleritis** is the most common subtype of anterior scleritis, characterized by widespread inflammation. - While common among anterior types, it represents a subset rather than the overall most common anatomical category. *Nodular anterior* - **Nodular anterior scleritis** presents with discrete nodules of inflamed scleral tissue. - It is less common than diffuse anterior scleritis but more common than necrotizing forms. *Posterior* - **Posterior scleritis** is rare, accounting for only about **2%** of all scleritis cases. - It involves inflammation posterior to the **equator of the globe** and can be difficult to diagnose due to its hidden location, often presenting with pain, proptosis, and vision loss.

Q: Blue sclera is associated with:

Osteogenesis imperfecta. ***Osteogenesis imperfecta*** - **Osteogenesis imperfecta** (brittle bone disease) is the **MOST CLASSIC** condition associated with blue sclera. - Caused by a defect in **Type I collagen synthesis**, which is a major structural component of the sclera. - The deficiency in functional collagen leads to an **abnormally thin and translucent sclera**, allowing the underlying **choroidal pigment** to show through, giving it a characteristic blue appearance. - Blue sclera is seen in **80-90% of patients** with Type I osteogenesis imperfecta. *Buphthalmos* - **Buphthalmos** (congenital glaucoma) can occasionally show bluish sclera due to scleral thinning from increased intraocular pressure. - However, the primary findings are **corneal enlargement, corneal edema**, and increased eye size, not blue sclera as a defining feature. *Marfan's syndrome* - **Marfan's syndrome** is a connective tissue disorder caused by **fibrillin-1** defects. - Classic ocular features include **ectopia lentis** (lens dislocation), high myopia, and retinal detachment risk. - Blue sclera is **NOT a recognized clinical feature** of Marfan's syndrome. *Ehlers-Danlos syndrome* - This connective tissue disorder can present with blue sclera due to collagen abnormalities. - However, it is **less common** than osteogenesis imperfecta as a cause of blue sclera.

Q: Blue sclera is seen in all except

keratoconus. ***keratoconus*** - **Keratoconus** is a condition where the cornea thins and bulges into a cone-like shape, leading to blurry vision and light sensitivity, but it does not cause blue sclera. - The sclera in keratoconus typically retains its normal white appearance. *Ehlers-Danlos syndrome* - **Ehlers-Danlos syndrome** is a group of genetic disorders affecting connective tissue, leading to overly flexible joints, stretchy skin, and fragile tissues. - The **thinness of the sclera** in these patients allows the underlying choroidal pigment to show through, making the sclera appear blue. *Marfan syndrome* - **Marfan syndrome** is a genetic disorder of connective tissue, causing issues in the heart, blood vessels, bones, joints, and eyes. - Similar to Ehlers-Danlos syndrome, the **sclera can be thinner** in Marfan syndrome, making it appear bluish due to the underlying choroidal vascularity. *Osteogenesis imperfecta* - **Osteogenesis imperfecta** is a genetic disorder characterized by fragile bones that break easily. It is caused by defects in type I collagen synthesis. - The sclera appears blue because the **underlying choroidal veins are visible** through the abnormally thin and translucent sclera.

Question 1

Blue sclera is seen in which of the following conditions?

Accepted Answer

Osteogenesis imperfecta

Answer

Alkaptonuria

Answer

Down syndrome

Answer

Kawasaki syndrome

Question 2

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 3

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 4

Ciliary staphyloma occurs due to all of the following except:

Accepted Answer

Episcleritis

Answer

Scleritis

Answer

Absolute glaucoma

Answer

Perforating injury

Question 5

Most common type of scleritis among the following is

Accepted Answer

Non-necrotizing

Answer

Necrotizing

Answer

Granulomatous

Answer

Posterior

Question 6

The most common variety of scleritis is:

Accepted Answer

Non-necrotizing anterior diffuse

Answer

Non-necrotizing anterior nodular

Answer

Anterior necrotizing without inflammation

Answer

Anterior necrotizing with inflammation

Question 7

Blue sclera is seen in all of the following conditions except:

Accepted Answer

Keratoconus

Answer

Marfan's syndrome

Answer

Osteogenesis imperfecta

Answer

Rheumatoid arthritis

Question 8

Most common type of scleritis is

Accepted Answer

Answer

Diffuse anterior

Answer

Nodular anterior

Answer

Posterior

Question 9

Blue sclera is associated with:

Accepted Answer

Osteogenesis imperfecta

Answer

Ehlers-Danlos syndrome

Answer

Buphthalmos

Answer

Marfan's syndrome

Question 10

Blue sclera is seen in all except

Accepted Answer

keratoconus

Answer

Ehlers-Danlos syndrome

Answer

Marfan syndrome

Answer

Osteogenesis imperfecta

Diseases of the Sclera — MCQs

Diseases of the Sclera — MCQs

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