Cornea MCQs: 40 Text-First Image-Pattern Questions

These are text-first pattern stems, deliberately not a substitute for cleared slit-lamp photographs or supervised clinical examination. In a real image question, first describe what is present—site, corneal layer, edge, stain, depth and associated sign—then give the most likely diagnosis. That sequence protects you from recognising one memorable sign and overcalling a disease.

This is exam education for postgraduate doctors, not a guide to diagnosing or treating a painful red eye. Infective keratitis and corneal thinning require clinical assessment and current local protocols. The MCQs use the examination-level morphology and anatomy supported by the source ledger at the end.

The five-part method for a cornea image stem

1. Site: central, paracentral or peripheral; one eye or both.
2. Layer: epithelium, Bowman layer, stroma, Descemet membrane or endothelium.
3. Pattern: dendrite, infiltrate, ring, line, guttae, diffuse oedema, cone or opacity.
4. Context: contact lens, water exposure, trauma, surgery, inherited pattern or systemic association.
5. Limit: name the leading answer, then state the key alternative if a single sign is non-specific.

40 cornea MCQs with worked explanations

1. The normal corneal epithelium is:

Answer: stratified squamous, non-keratinised epithelium. It is the anterior barrier and is continuously renewed. Do not confuse it with conjunctival epithelium when a stem asks about corneal transparency or the epithelial defect seen with fluorescein.

2. Bowman layer after a deep injury is best described as:

Answer: not truly regenerated. It may scar rather than return as normal Bowman layer. In an SBA, its location between epithelium and stroma is usually the discriminator.

3. Descemet membrane is the basement membrane of the:

Answer: corneal endothelium. A stem with posterior corneal guttae is therefore asking you to think in the Descemet–endothelial compartment, not the epithelium.

4. The endothelial pump–barrier system principally maintains corneal:

Answer: relative deturgescence. Clear stroma depends on controlled hydration. “Endothelium makes tears” is an anatomy distractor; tears are an ocular-surface structure, not an endothelial product.

5. Fluorescein is most useful for demonstrating a:

Answer: corneal epithelial defect. It highlights a break in the epithelial surface. It does not itself identify the organism or prove that every infiltrate is infectious.

6. A branching epithelial lesion with terminal bulbs on a text-described slit-lamp image suggests:

Answer: HSV epithelial keratitis. Terminal bulbs are the classic differentiating clue for a true dendrite. In an exam, give the morphology before the label.

7. A raised pseudodendrite without terminal bulbs is more consistent with:

Answer: herpes zoster epithelial disease. The absence of terminal bulbs is a useful contrast with HSV, but no isolated morphology should be treated as a complete real-world diagnostic work-up.

8. Severe pain with contact-lens or water exposure and a ring infiltrate should make the candidate consider:

Answer: Acanthamoeba keratitis. This is a pattern prompt, not a diagnostic rule. Ring infiltrate and disproportionate pain may be absent early and can have other differentials.

9. A contact-lens wearer has a rapidly progressive suppurative corneal ulcer. Which organism is a classic exam association?

Answer: Pseudomonas aeruginosa. The useful answer is “a bacterial keratitis context including Pseudomonas”, not “contact lens equals Pseudomonas”; history raises a differential rather than proving microbiology.

10. A dry, raised stromal infiltrate with feathery edges most strongly supports:

Answer: fungal keratitis in the differential. Satellite lesions may reinforce that pattern. It is safer in a viva to describe the morphology and explain why fungal disease is considered than to declare an organism from one feature.

11. Hypopyon in an ulcer stem is:

Answer: a clinical sign, not a microbiological diagnosis. It indicates anterior chamber inflammatory cells. It does not distinguish bacterial from fungal keratitis by itself.

12. The best first description of a corneal ulcer is:

Answer: site, size, depth, epithelial defect, infiltrate, thinning and anterior chamber reaction. A diagnosis label without this grid loses marks because it does not show that you assessed severity or morphology.

13. A ring infiltrate is:

Answer: not pathognomonic for Acanthamoeba. It is a memorable association, which is why it makes a common MCQ trap. A good answer uses it as one element alongside exposure history, pain and other examination features.

14. Lissamine green and rose bengal are classically used to highlight:

Answer: compromised ocular-surface epithelium and mucus. Contrast this with fluorescein, which is the standard test answer for an epithelial defect.

15. Keratoconus is characterised by:

Answer: progressive corneal ectasia with thinning, often inferior or inferotemporal. The exam word is ectasia. Do not reduce it to “a steep cornea” when the stem asks for the structural abnormality.

16. A Fleischer ring is:

Answer: epithelial iron deposition at the base of a cone. It is a classic keratoconus clue. It is not the same as a Kayser–Fleischer ring, which is a peripheral Descemet-level finding.

17. Vogt striae in keratoconus are best described as:

Answer: fine vertical stromal stress lines that disappear with pressure. Their reversibility with gentle pressure is the high-yield distinction from a fixed scar.

18. Munson sign refers to:

Answer: V-shaped lower-lid deformation on downgaze in advanced keratoconus. It is a late external sign. Its absence does not exclude earlier ectasia.

19. Corneal topography primarily maps:

Answer: corneal curvature. Tomography adds three-dimensional information, including posterior-surface and pachymetric assessment. The question is often testing this distinction rather than asking which machine is “best”.

20. Acute corneal hydrops in keratoconus follows:

Answer: a break in Descemet membrane. Aqueous enters the stroma, causing acute oedema. In a theory answer, state the layer and mechanism; do not turn this into a management instruction.

21. Fuchs endothelial corneal dystrophy is classically associated with:

Answer: central guttae and endothelial dysfunction. Guttae are posterior corneal findings. They are not synonymous with every cause of oedema.

22. Morning blur that improves during the day is a familiar history clue for:

Answer: corneal oedema in an endothelial-dysfunction framework. It is a pattern clue, not a stand-alone diagnosis of Fuchs endothelial corneal dystrophy.

23. Epithelial basement membrane dystrophy is also commonly called:

Answer: map-dot-fingerprint dystrophy. The name tells you the layer: epithelial basement membrane. It should not be placed with the stromal dystrophies merely because “corneal dystrophy” appears in the name.

24. Discrete crumb-like stromal opacities are most typical of:

Answer: granular corneal dystrophy. The revision task is to connect a deposition pattern to its layer, then to use current classification when terminology is questioned.

25. Lattice corneal dystrophy is associated with stromal deposits of:

Answer: amyloid. “Lattice = amyloid” is a sound exam hook, provided you do not use it to ignore phenotype and inheritance when the question provides more detail.

26. Macular corneal dystrophy involves stromal deposition of:

Answer: glycosaminoglycans. It is a stromal dystrophy. The terms granular, lattice and macular are often tested together because their material differs.

27. Arcus is best described as:

Answer: peripheral corneal lipid deposition, often with a lucid interval from the limbus. This distinguishes it from a ring at Descemet membrane and from a corneal infiltrate.

28. A Kayser–Fleischer ring is located at the level of:

Answer: Descemet membrane. In an SBA, compare it with the epithelial Fleischer ring of keratoconus. The similar names are deliberate distractor material.

29. A linear Descemet-membrane break in congenital glaucoma is called:

Answer: a Haab stria. The layer is more valuable than the eponym: describe it as a Descemet break before naming it.

30. Penetrating keratoplasty (PK) replaces:

Answer: full-thickness cornea. If the question asks the tissue plane, PK is the full-thickness answer; it is not an anterior lamellar procedure.

31. Deep anterior lamellar keratoplasty (DALK) differs from PK because it:

Answer: preserves recipient Descemet membrane and endothelium. This tissue distinction is the exam-safe answer. Whether it is suitable for a particular eye is a separate clinical judgement.

32. DSAEK graft tissue includes:

Answer: donor endothelium, Descemet membrane and a thin posterior stromal component. The stromal component is the shortcut distinction from DMEK.

33. DMEK transfers:

Answer: donor Descemet membrane and endothelium without donor stroma. Say the tissue explicitly. “Endothelial keratoplasty” alone cannot distinguish DMEK from DSAEK.

34. A Khodadoust line is associated with:

Answer: endothelial graft rejection. The line moves across the endothelium in the classic description. It belongs to the graft-rejection pattern, not the infectious-ulcer pattern.

35. The cornea receives sensory innervation chiefly through:

Answer: the ophthalmic division of the trigeminal nerve. The long ciliary nerves carry the major corneal sensory supply. A numb cornea should therefore make a candidate think about the corneal-nerve framework.

36. Marked epithelial disease with relatively little pain can be a clue to:

Answer: neurotrophic keratopathy. This is the reverse of the Acanthamoeba teaching pattern. It is a reminder that pain intensity and visible epithelial disease do not always move together.

37. Peripheral ulcerative keratitis should prompt consideration of:

Answer: a systemic inflammatory association in the differential. The key word is consideration. This is a high-risk clinical pattern and should not be converted into a one-line self-management plan.

38. Mooren ulcer is classically described as:

Answer: a progressive peripheral ulcerative keratitis without associated scleritis. The absence of scleritis is a classical discriminator in examination questions, not a substitute for a full differential.

39. A pterygium is distinguished from a pinguecula because it:

Answer: crosses the limbus onto the cornea. The limbus is the anatomical boundary that makes this a simple visual-recognition question.

40. In a photographic cornea SBA, the safest first sentence is:

Answer: a neutral morphologic description before the diagnosis. For example: “There is a central epithelial defect with a stromal infiltrate and anterior chamber reaction.” This shows the examiner what you saw and limits premature anchoring.

The three high-yield contrasts to redraw

Use the score report, not just the answer key

After a block, label each wrong question as layer, morphology, context, eponym, or graft tissue. Then redo one unseen question from that label. A candidate who repeatedly calls the Fleischer ring a Descemet finding does not need another 40 random questions; they need a two-column epithelial-versus-Descemet comparison.

For a broader written cornea revision route, use the verified cornea study guide. For mixed recall after this topic block, use general ophthalmology MCQs. The Handwritten Exam Ready Notes collection is a relevant notes route; check the current product scope before choosing any individual resource.

Sources and scope

The sources below were checked on 18 August 2026. They support anatomy, morphology, classification and graft-tissue terminology. The article does not use them to provide patient-specific management advice.

1. AAO: Bacterial Keratitis Preferred Practice Pattern — ulcer assessment and microbial-keratitis framework.
2. Bacterial Keratitis, StatPearls — examination and descriptive terminology.
3. Acanthamoeba keratitis review — classic signs and their limitations.
4. IC3D Classification of Corneal Dystrophies, Edition 3 — dystrophy classification and terminology.
5. Fuchs Endothelial Corneal Dystrophy, GeneReviews — endothelial-dystrophy phenotype context.
6. Deep anterior lamellar keratoplasty review — DALK tissue plane.
7. DMEK review — DMEK graft composition.