Explore the physiology of ocular movements mcq bank and binocular vision extraocular muscles, ductions, versions, vergence, fusion, stereopsis, diplopia, suppression, and more. A concise guide to eye‑movement control and binocular single vision. Visit our index page to find topic wise ophthalmology mcq

Physiology of Eye and Vision (500 MCQs) By MCQ Zone
This PDF file contains Part 18 to Part 27 ● Cornea, Aqueous Humor & Intraocular Pressure (80 MCQ) ● Lens and Vitreous Physiology (40 MCQ) ● Retina and phototransduction (80 MCQ) ● Ocular Movements & Binocular Vision (60 MCQ) ● Accommodation mcq & Pupillary Reflexes (60 MCQ) ● Electrophysiology mcq: ERG. Download PDF

Extraocular Movements & Muscles

1. How many extraocular muscles control eyeball movement?
A. 4
B. 6
C. 8
D. 10

View Answer

B. 6 ✅ Exp: Four recti + two obliques.

2. The primary action of the superior oblique muscle is:
A. Abduction
B. Intorsion
C. Depression in adduction
D. Elevation

View Answer

C. Depression in adduction ✅ Exp: SO intorts and depresses in adduction.

3. The primary action of the inferior oblique muscle is:
A. Intorsion
B. Extorsion
C. Depression
D. Adduction

View Answer

B. Extorsion ✅ Exp: IO extorts and elevates in adduction.

4. Superior rectus acts maximally in:
A. Adduction
B. Abduction
C. Neutral gaze
D. Depression

View Answer

B. Abduction ✅ Exp: SR elevates best in abduction.

5. Inferior rectus depresses maximally in:
A. Adduction
B. Abduction
C. Neutral gaze
D. Intorsion

View Answer

B. Abduction ✅ Exp: IR depresses best in abduction.

6. Hering’s law of equal innervation states:
A. Yoke muscles receive equal innervation
B. Agonist-antagonist muscles balance each other
C. Same eye muscles act together
D. Only vertical muscles are paired

View Answer

A. Yoke muscles receive equal innervation ✅ Exp: Yoke muscles in both eyes receive equal input.

7. Sherrington’s law of reciprocal innervation means:
A. Contraction of agonist → relaxation of antagonist
B. Both muscles contract simultaneously
C. Only one muscle works at a time
D. Applies only to vertical gaze

View Answer

A. Contraction of agonist → relaxation of antagonist ✅ Exp: Agonist-antagonist relation in same eye.

8. Duction refers to:
A. Monocular eye movement
B. Binocular eye movement
C. Version movement
D. Vergence movement

View Answer

A. Monocular eye movement ✅ Exp: Movement of one eye in any direction.

9. Version refers to:
A. Conjugate binocular eye movement
B. Divergence
C. Monocular adduction
D. Cyclotorsion

View Answer

A. Conjugate binocular eye movement ✅ Exp: Both eyes move in same direction.

10. Vergence refers to:
A. Conjugate binocular movement
B. Disconjugate binocular movement
C. Monocular movement
D. Intorsion only

View Answer

B. Disconjugate binocular movement ✅ Exp: Eyes move in opposite directions (e.g., convergence, divergence).

11. Binocular single vision requires:
A. Equal acuity both eyes
B. Normal alignment of visual axes
C. Fusion mechanism
D. All of the above

View Answer

D. All of the above ✅ Exp: Normal acuity, alignment, and fusion are needed.

12. The three grades of binocular vision (Worth’s classification) are:
A. Simultaneous perception, fusion, stereopsis
B. Fusion, suppression, diplopia
C. Stereopsis, convergence, fusion
D. Suppression, stereopsis, amblyopia

View Answer

A. Simultaneous perception, fusion, stereopsis ✅ Exp: First → simultaneous perception → fusion → stereopsis.

13. Stereopsis refers to:
A. Depth perception
B. Fusion
C. Color vision
D. Accommodation

View Answer

A. Depth perception ✅ Exp: 3D vision from retinal disparity.

14. Normal stereopsis threshold is:
A. 1–2 arc sec
B. 15–60 arc sec
C. 100 arc sec
D. 1 arc min

View Answer

B. 15–60 arc sec ✅ Exp: Fine stereopsis = <60 arc sec.

15. Which test assesses stereopsis?
A. Snellen chart
B. Titmus fly test
C. Ishihara test
D. Worth’s test

View Answer

B. Titmus fly test ✅ Exp: Titmus fly measures depth perception.

Physiology of Eye and Vision (500 MCQs) By MCQ Zone
This PDF file contains Part 18 to Part 27 ● Cornea, Aqueous Humor & Intraocular Pressure (80 MCQ) ● Lens and Vitreous Physiology (40 MCQ) ● Retina and phototransduction (80 MCQ) ● Ocular Movements & Binocular Vision (60 MCQ) ● Accommodation mcq & Pupillary Reflexes (60 MCQ) ● Electrophysiology mcq: ERG. Download PDF

16. The condition where both eyes see simultaneously but images are not fused:
A. Diplopia
B. Suppression
C. Fusion
D. Stereopsis

View Answer

A. Diplopia ✅ Exp: Double vision occurs if fusion fails.

17. Suppression is a mechanism to:
A. Improve fusion
B. Eliminate diplopia
C. Increase stereopsis
D. Compensate refractive error

View Answer

B. Eliminate diplopia ✅ Exp: Brain ignores image from deviating eye.

18. Anomalous retinal correspondence (ARC) occurs in:
A. Strabismus
B. Glaucoma
C. Macular degeneration
D. Optic neuritis

View Answer

A. Strabismus ✅ Exp: Fovea of one eye corresponds with extrafoveal area of other.

19. Panum’s fusional area allows:
A. Limited retinal disparity for fusion
B. Binocular suppression
C. Cyclodeviation
D. Diplopia always

View Answer

A. Limited retinal disparity for fusion ✅ Exp: Small disparity tolerated without diplopia.

20. Fusion reserve is assessed with:
A. Prism bar testing
B. Snellen chart
C. Ishihara plates
D. Maddox rod

View Answer

A. Prism bar testing ✅ Exp: Measures fusional vergence capacity.

21. Diplopia worse on looking left indicates palsy of:
A. Right lateral rectus
B. Left lateral rectus
C. Left medial rectus
D. Right medial rectus

View Answer

B. Left lateral rectus ✅ Exp: Diplopia worse in field of action of paralyzed muscle.

22. A patient with vertical diplopia improves by head tilt. Likely palsy is:
A. Superior oblique
B. Inferior rectus
C. Lateral rectus
D. Superior rectus

View Answer

A. Superior oblique ✅ Exp: SO palsy → head tilt compensation.

23. Bielschowsky head tilt test is used for:
A. Lateral rectus palsy
B. Superior oblique palsy
C. Medial rectus palsy
D. Inferior rectus palsy

View Answer

B. Superior oblique palsy ✅ Exp: Detects vertical/torsional imbalance.

24. Paralytic squint differs from concomitant squint in:
A. Diplopia
B. No ocular movement restriction
C. Same deviation in all gazes
D. No head tilt

View Answer

A. Diplopia ✅ Exp: Paralytic squint has diplopia + limited movement.

25. Maddox rod test detects:
A. Phoria
B. Color vision
C. Stereopsis
D. Accommodation

View Answer

A. Phoria ✅ Exp: Used to detect latent squint.

26. Worth’s four-dot test detects:
A. Suppression & fusion
B. Color vision
C. Field defect
D. Visual acuity

View Answer

A. Suppression & fusion ✅ Exp: Evaluates binocular function.

27. Synoptophore is used for:
A. Testing binocular vision
B. Testing accommodation
C. Visual acuity
D. Contrast sensitivity

View Answer

A. Testing binocular vision ✅ Exp: Evaluates simultaneous perception, fusion, stereopsis.

28. Cover-uncover test detects:
A. Tropia
B. Phoria
C. Diplopia
D. Fusion

View Answer

A. Tropia ✅ Exp: Reveals manifest squint.

29. Alternate cover test detects:
A. Phoria
B. Tropia
C. Amblyopia
D. Stereopsis

View Answer

A. Phoria ✅ Exp: Reveals latent squint.

30. Convergence insufficiency presents as:
A. Diplopia at near
B. Diplopia at distance
C. Loss of color vision
D. Night blindness

View Answer

A. Diplopia at near ✅ Exp: Inadequate convergence → near diplopia.

Physiology of Eye and Vision (500 MCQs) By MCQ Zone
This PDF file contains Part 18 to Part 27 ● Cornea, Aqueous Humor & Intraocular Pressure (80 MCQ) ● Lens and Vitreous Physiology (40 MCQ) ● Retina and phototransduction (80 MCQ) ● Ocular Movements & Binocular Vision (60 MCQ) ● Accommodation mcq & Pupillary Reflexes (60 MCQ) ● Electrophysiology mcq: ERG. Download PDF