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Rationales 2026/2027 Q&A| Instant Download pdf
1. Which of the following structures is primarily responsible for focusing light onto the
retina?
A. Lens
B. Cornea
C. Iris
D. Retina
Answer & Rationale: B. Cornea – The cornea provides the majority of the eye’s refractive
power, bending light rays toward the retina.
2. Which of the following controls the amount of light entering the eye?
A. Lens
B. Iris
C. Retina
D. Optic nerve
Answer & Rationale: B. Iris – The iris adjusts pupil size to regulate light entry.
3. Which condition is characterized by difficulty seeing distant objects clearly?
A. Myopia
B. Hyperopia
C. Astigmatism
D. Presbyopia
Answer & Rationale: A. Myopia – Nearsightedness results from light focusing in front of
the retina.
4. Which condition is associated with aging and loss of near vision?
A. Presbyopia
B. Myopia
C. Glaucoma
D. Cataract
Answer & Rationale: A. Presbyopia – Age-related loss of lens elasticity affects near vision.
5. Which structure contains photoreceptor cells?
A. Retina
B. Cornea
, C. Sclera
D. Lens
Answer & Rationale: A. Retina – Contains rods and cones responsible for vision.
6. Which of the following is the function of rods?
A. Night vision
B. Color vision
C. Depth perception
D. Peripheral vision only
Answer & Rationale: A. Night vision – Rods are sensitive to low light conditions.
7. Which of the following is the function of cones?
A. Color vision
B. Night vision
C. Peripheral vision
D. Motion detection
Answer & Rationale: A. Color vision – Cones function in bright light and color
discrimination.
8. Which of the following is the normal intraocular pressure range?
A. 10–21 mmHg
B. 5–10 mmHg
C. 22–30 mmHg
D. 30–40 mmHg
Answer & Rationale: A. 10–21 mmHg – Normal intraocular pressure range.
9. Which condition is associated with increased intraocular pressure?
A. Glaucoma
B. Cataract
C. Myopia
D. Conjunctivitis
Answer & Rationale: A. Glaucoma – Elevated pressure damages the optic nerve.
10. Which of the following is used to measure intraocular pressure?
A. Tonometry
B. Ophthalmoscopy
C. Retinoscopy
D. Perimetry
Answer & Rationale: A. Tonometry – Measures pressure inside the eye.
, 11. Which condition is characterized by clouding of the lens?
A. Cataract
B. Glaucoma
C. Retinopathy
D. Keratitis
Answer & Rationale: A. Cataract – Opacification of the lens affects vision.
12. Which test evaluates visual acuity?
A. Snellen chart
B. Tonometry
C. Retinoscopy
D. Pachymetry
Answer & Rationale: A. Snellen chart – Standard test for visual sharpness.
13. Which of the following is the blind spot in the retina?
A. Optic disc
B. Macula
C. Fovea
D. Cornea
Answer & Rationale: A. Optic disc – Lacks photoreceptors, creating a blind spot.
14. Which structure is responsible for central vision?
A. Fovea
B. Cornea
C. Lens
D. Sclera
Answer & Rationale: A. Fovea – Contains high density of cones for sharp vision.
15. Which condition involves irregular curvature of the cornea?
A. Astigmatism
B. Myopia
C. Hyperopia
D. Presbyopia
Answer & Rationale: A. Astigmatism – Causes distorted vision due to uneven curvature.
16. Which of the following is used to examine the retina?
A. Ophthalmoscope
B. Tonometer
C. Retinoscope
D. Perimeter