A person can see nearby objects clearly but cannot see distant object distinctly, the person is suffering with
- (a)Hypermetropia
- (b)Presbyopia
- (c)Myopia
- (d)None of above
Correct — C, Myopia. Myopia (short-sightedness or near-sightedness) is exactly the defect described: near objects are seen clearly but distant objects look blurred. It happens when the eyeball is too long, or the eye lens too strongly converging, so parallel rays from a distant object are brought to a focus in front of the retina instead of on it. It is corrected with a concave (diverging) lens of suitable power, which spreads the rays so the image falls back onto the retina.
- (a)Hypermetropia — Hypermetropia (long-sightedness) is the opposite defect — distant objects are seen clearly but near objects are blurred because the image forms behind the retina; it is corrected with a convex lens.
- (b)Presbyopia — Presbyopia is the age-related loss of the eye's power to accommodate (the near point recedes), so it mainly troubles near vision in older people; it is not the 'clear near, blurred far' pattern described.
- (d)None of above — The condition clearly matches a named defect — myopia — so 'none of the above' does not apply.
The human eye focuses light with a variable-focus lens onto the retina. The common refractive defects are myopia (near-sight), hypermetropia (far-sight) and presbyopia (age-related loss of accommodation). In myopia the far point moves closer than infinity, so distant objects cannot be brought to a focus on the retina.
Sort the defects by which distance is blurred: 'far blurred, near clear' is myopia (concave-lens correction); 'near blurred, far clear' is hypermetropia (convex-lens correction); 'near blurred with age' is presbyopia. The wording 'sees near clearly, cannot see distant distinctly' locks in myopia.
- In myopia the image of a distant object forms in front of the retina, and it is corrected by a concave (diverging) lens.
- In hypermetropia the image forms behind the retina, and it is corrected by a convex (converging) lens.
- Presbyopia is the age-related stiffening of the eye lens that reduces accommodation and often needs bifocals.
- Lens power is measured in dioptres (D), and a concave corrective lens has negative power.
The described symptom — near clear, far blurred — is myopia (option C).
- Confusing myopia and hypermetropia — remember myopia means distant objects are blurred and needs a concave lens.
- Treating presbyopia as the same as hypermetropia; presbyopia is the age-related loss of accommodation.
Described by symptoms (which distance is blurred) or by asking which lens corrects the defect.
No directly related past PYQ was found.
- practice — not a real PYQ
Which type of lens is used to correct myopia?
- (a)Convex
- (b)Concave
- (c)Cylindrical
- (d)Plano-convex
Answer(b) Concave — a diverging lens moves the image back onto the retina.
- practice — not a real PYQ
A person cannot see nearby objects clearly but sees distant objects distinctly. The defect is
- (a)Myopia
- (b)Hypermetropia
- (c)Cataract
- (d)Colour blindness
Answer(b) Hypermetropia — near blurred, far clear, corrected by a convex lens.