General Features of Eyeball MCQs Learn the anatomy of the eyeball with MCQs on shape, diameters, volume, poles, and equator. Perfect for ophthalmology and Optometry mcq for exams & NEET PG prep.
General Features of Eyeball
1. The eyeball is best described as:
A. Perfect sphere
B. Oblate spheroid
C. Ellipsoid
D. Sphere with uniform curvature
View Answer
B. Oblate spheroid ✅ Explanation: Eyeball is not a true sphere but an oblate spheroid.
2. The anteroposterior diameter of an adult eyeball is:
A. 22 mm
B. 23 mm
C. 24 mm
D. 25 mm
View answer
C. 24 mm ✅ Explanation: Adult AP diameter ≈ 24 mm.
3. The horizontal diameter of eyeball is:
A. 22.5 mm
B. 23.5 mm
C. 24 mm
D. 25 mm
View Answer
B. 23.5 mm ✅ Explanation: Horizontal = 23.5 mm.
4. The vertical diameter of eyeball is:
A. 22 mm
B. 23 mm
C. 23.5 mm
D. 24 mm
View Answer
B. 23 mm ✅ Explanation: Vertical = 23 mm.
5. The volume of adult eyeball is about:
A. 5 ml
B. 6.5 ml
C. 7.5 ml
D. 8 ml
View Answer
B. 6.5 ml ✅ Explanation: Eyeball volume ≈ 6.5 ml.
6. Average weight of adult eyeball:
A. 5 g
B. 6 g
C. 7 g
D. 8 g
View Answer
C. 7 g ✅ Explanation: Adult eyeball ≈ 7 g.
7. The anterior pole of eyeball refers to:
A. Corneal apex
B. Optic disc
C. Limbus
D. Macula
View Answer
A. Corneal apex ✅ Explanation: Central point of corneal curvature.
8. The posterior pole is:
A. Macula
B. Optic disc
C. Central point on posterior convexity
D. Fovea centralis
View Answer
C. Central point on posterior convexity ✅ Explanation: Posterior pole = central point on posterior surface.
9. Equator of eyeball lies:
A. At corneoscleral junction
B. Midway between anterior and posterior poles
C. Through optic nerve
D. At limbus
View Answer
B. Midway between anterior and posterior poles ✅ Explanation: Equator lies at mid-plane.
10. Circumference of adult eyeball:
A. 65 mm
B. 70 mm
C. 75 mm
D. 80 mm
View Answer
C. 75 mm ✅ Explanation: Adult circumference ≈ 75 mm.
Coats of the Eyeball
11. Fibrous coat of eyeball includes:
A. Iris + sclera
B. Cornea + sclera
C. Choroid + sclera
D. Retina + sclera
View Answer
B. Cornea + sclera ✅ Explanation: Fibrous coat = cornea (1/6) + sclera (5/6).
12. Junction of cornea and sclera:
A. Limbus
B. Ora serrata
C. Optic disc
D. Equator
View Answer
A. Limbus ✅ Explanation: Corneoscleral junction = limbus.
13. Vascular coat of eyeball is also called:
A. Uvea
B. Retina
C. Corneoscleral coat
D. Endothelium
View Answer
A. Uvea ✅ Explanation: Uveal tract = iris, ciliary body, choroid.
14. Nervous coat of eyeball is:
A. Sclera
B. Retina
C. Choroid
D. Iris
View Answer
B. Retina ✅ Explanation: Retina forms nervous coat.
15. Which layer is responsible for vision?
A. Sclera
B. Retina
C. Cornea
D. Lens
View Answer
B. Retina ✅ Explanation: Retina processes visual signals.
Segments & Chambers
16. The anterior segment includes:
A. Vitreous
B. Retina
C. Lens, cornea, iris, anterior & posterior chambers
D. Optic disc
View Answer
C. Lens, cornea, iris, anterior & posterior chambers ✅ Explanation: Anterior segment = lens + structures anterior to it
17. Average depth of anterior chamber in adults:
A. 1.5 mm
B. 2.5 mm
C. 3.0 mm
D. 4.0 mm
View Answer
B. 2.5 mm ✅ Explanation: Depth ≈ 2.5 mm at centre.
18. Anterior chamber volume:
A. 0.15 ml
B. 0.25 ml
C. 0.35 ml
D. 0.5 ml
View Answer
B. 0.25 ml ✅ Explanation: Contains ≈ 0.25 ml aqueous humour.
19. Posterior chamber volume:
A. 0.02 ml
B. 0.04 ml
C. 0.06 ml
D. 0.1 ml
View Answer
C. 0.06 ml ✅ Explanation: Posterior chamber ≈ 0.06 ml aqueous humour.
20. Posterior segment contains:
A. Cornea + iris
B. Lens + aqueous humour
C. Vitreous + retina + choroid + optic disc
D. Sclera + conjunctiva
View Answer
C. Vitreous + retina + choroid + optic disc ✅ Explanation: Posterior segment = structures behind lens.
Cornea & Sclera
21. Transparency of cornea is due to:
A. Blood supply
B. Regular stromal arrangement
C. Thick stroma
D. Pigment cells
View Answer
B. Regular stromal arrangement ✅ Explanation: Transparency due to avascularity + uniform collagen lamellae.
22. Which part of fibrous coat is transparent?
A. Sclera
B. Cornea
C. Iris
D. Retina
View Answer
B. Cornea ✅ Explanation: Cornea transmits light.
23. Sclera forms how much of fibrous coat?
A. 1/4
B. 1/2
C. 5/6
D. 3/4
View Answer
C. 5/6 ✅ Explanation: Posterior 5/6 of fibrous coat is sclera.
24. Cornea forms how much of fibrous coat?
A. 1/2
B. 1/4
C. 1/6
D. 1/8
View Answer
C. 1/6 ✅ Explanation: Anterior 1/6 is cornea.
Lens, Iris & Ciliary Body Relations
25. Lens is suspended from:
A. Iris
B. Retina
C. Ciliary body via zonules
D. Sclera
View Answer
C. Ciliary body via zonules ✅ Explanation: Zonular fibres hold lens.
26. The iris is part of:
A. Retina
B. Cornea
C. Uveal tract
D. Fibrous coat
View Answer
C. Uveal tract ✅ Explanation: Uveal coat has iris anteriorly.
27. Ciliary body lies between:
A. Iris & sclera
B. Iris & choroid
C. Cornea & iris
D. Retina & sclera
View Answer
B. Iris & choroid ✅ Explanation: Ciliary body is between iris & choroid.
28. Depth of anterior chamber is shallower in:
A. Myopia
B. Hypermetropia
C. Emmetropia
D. Presbyopia
View Answer
B. Hypermetropia ✅ Explanation: Hypermetropes → shallow chamber.
29. Depth of anterior chamber is deeper in:
A. Hypermetropia
B. Myopia
C. Presbyopia
D. Emmetropia
View Answer
B. Myopia ✅ Explanation: Myopes → deeper chamber.
30. Normal adult anterior chamber depth is:
A. 1 mm
B. 2.5 mm
C. 3.5 mm
D. 4 mm
View Answer
B. 2.5 mm ✅ Explanation: Depth ≈ 2.5 mm.
Visual Pathway
31. Visual pathway begins from:
A. Retina
B. Cornea
C. Lens
D. Iris
View Answer
A. Retina ✅ Explanation: Retina perceives light and starts the pathway.
32. The optic nerve exits at:
A. Fovea
B. Optic disc
C. Macula
D. Equator
View Answer
B. Optic disc ✅ Explanation: Optic nerve originates at optic disc.
33. The visual pathway ends in:
A. Midbrain
B. Lateral geniculate body
C. Occipital cortex
D. Thalamus
View Answer
C. Occipital cortex ✅ Explanation: Final perception occurs at occipital cortex.
34. Crossing of nasal retinal fibres occurs at:
A. Optic tract
B. Optic chiasma
C. Lateral geniculate body
D. Superior colliculus
View Answer
B. Optic chiasma ✅ Explanation: Nasal fibres cross at chiasma; temporal fibres remain uncrossed.
Orbit & Extraocular Structures
35. The eyeball is lodged in:
A. Sphenoid sinus
B. Orbit
C. Ethmoid sinus
D. Frontal sinus
View Answer
B. Orbit ✅ Explanation: Eye sits in orbital cavity.
36. Shape of orbit:
A. Cuboidal
B. Quadrilateral pyramid
C. Cylindrical
D. Cone-shaped
View Answer
B. Quadrilateral pyramid ✅ Explanation: Orbit is quadrilateral pyramid with base anterior, apex posterior.
37. Number of extraocular muscles:
A. 4
B. 5
C. 6
D. 7
View Answer
C. 6 ✅ Explanation: 6 extraocular muscles: 4 recti + 2 obliques.
38. Eye appendages include:
A. Eyelids, conjunctiva, lacrimal apparatus
B. Retina, sclera, cornea
C. Ciliary body, iris, choroid
D. Lens, vitreous, retina
View Answer
A. Eyelids, conjunctiva, lacrimal apparatus ✅ Explanation: Appendages protect and support eyeball.
39. Main artery of the eye:
A. External carotid
B. Internal carotid → ophthalmic artery
C. Middle cerebral artery
D. Vertebral artery
View Answer
B. Internal carotid → ophthalmic artery ✅ Explanation: Ophthalmic artery (branch of ICA) supplies eye.
40. Central retinal artery supplies:
A. Lens
B. Retina
C. Choroid
D. Sclera
View Answer
B. Retina ✅ Explanation: CRA supplies inner retina.
Understanding the general features of the eyeball its diameters, chambers, coats, and clinical correlations is essential for building a strong foundation in ophthalmology. These MCQs not only help in exam preparation for NEET PG, INI CET, AIIMS, and optometry exams, but also strengthen your clinical concepts.
Keep revising regularly, practice more ophthalmology MCQs, and explore related topics like ocular physiology, retina, and visual pathways for complete preparation.
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