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Khurana 2

 From the pages you shared (first chapter of Anatomy of Eye in Comprehensive Ophthalmology – A.K. Khurana), examiners usually ask “named concepts” rather than long paragraphs. These are short definitions or anatomical terms that carry a specific name.

Below are the high-yield named concepts from these pages that MBBS examiners frequently ask in viva/short notes.

Important Named Concepts (Anatomy of Eye)

1. Poles of the Eyeball

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Definition:
The poles are the two central points of the maximal curvature of the eyeball.

Types

  • Anterior pole – centre of cornea

  • Posterior pole – centre of posterior curvature of sclera

Related concept

  • Axis of eyeball – imaginary line joining anterior and posterior poles.

Examiner favourite viva question:
"What are the poles of the eyeball?"

2. Equator of the Eyeball

Definition:
The equator is an imaginary circular line midway between the anterior and posterior poles of the eyeball.

Importance

  • Divides eyeball into anterior half and posterior half.

  • Used as a reference point in ophthalmic surgery and anatomy.

3. Ora Serrata

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Definition:
The ora serrata is the anterior serrated margin of the retina where the retina ends and the ciliary body begins.

Key points

  • Marks the transition from photosensitive retina → non-photosensitive epithelium

  • Appears toothed or serrated

Exam question:
"What is ora serrata?"

4. Limbus

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Definition:
The limbus is the junction between the cornea and sclera.

Important facts

  • Conjunctiva firmly attaches here

  • Important surgical landmark

  • Contains limbal stem cells

Examiner favourite:
"Define limbus."

5. Coats of the Eyeball

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Eyeball has 3 coats (tunics).

1. Fibrous coat

  • Cornea

  • Sclera

Function: protection and shape.

2. Vascular coat (Uveal tract)

  • Iris

  • Ciliary body

  • Choroid

Function: nutrition and accommodation.

3. Nervous coat

  • Retina

Function: vision.

Exam question:
"Name the coats of the eyeball."

6. Anterior Chamber

Definition:
The space between cornea and iris filled with aqueous humour.

Boundaries

  • Anterior → posterior surface of cornea

  • Posterior → anterior surface of iris

Normal depth

  • About 2.5 mm

Volume of aqueous humour

  • ~ 0.25 ml

7. Posterior Chamber

Definition:
The triangular space between iris and lens.

Boundaries

  • Anterior → posterior surface of iris

  • Posterior → lens and zonules

  • Lateral → ciliary body

Contains aqueous humour.

8. Segments of the Eyeball

The eye is divided into two segments.

1. Anterior segment

Contains:

  • Cornea

  • Iris

  • Lens

  • Aqueous humour

  • Anterior chamber

  • Posterior chamber

2. Posterior segment

Contains:

  • Vitreous humour

  • Retina

  • Choroid

  • Optic disc

9. Appendages of the Eye

Structures that protect and support the eyeball.

Includes:

  • Eyelids

  • Eyebrows

  • Conjunctiva

  • Lacrimal apparatus

Exam question:
"What are appendages of the eye?"

10. Visual Pathway

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Definition:
The pathway through which visual impulses travel from retina to the brain.

Sequence

  1. Retina

  2. Optic nerve

  3. Optic chiasma

  4. Optic tract

  5. Lateral geniculate body

  6. Optic radiation

  7. Visual cortex (occipital lobe)

Ultra-High Yield Viva One-liners

Memorize these exactly.

  • Shape of eyeball: Oblate spheroid

  • AP diameter: 24 mm

  • Horizontal diameter: 23.5 mm

  • Vertical diameter: 23 mm

  • Volume: 6.5 ml

  • Weight: ~7 g

✅ Most asked in MBBS viva from this chapter

  1. Poles of eyeball

  2. Equator of eyeball

  3. Ora serrata

  4. Limbus

  5. Coats of eyeball

  6. Anterior vs posterior chamber

  7. Segments of eyeball

  8. Visual pathway

If you want, I can also give the “Top 20 examiner favourite named concepts from the whole Ophthalmology book” that come repeatedly in MBBS viva and NEET-PG.

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