Optics: contact lens and spectacle: practice question

A Ophthalmology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Ophthalmology · Optics: contact lens and spectacle

Sample item

Compared with spectacles, which statement about a contact lens in aphakia or high myopia is correct?

AIt cannot be used after surgeryBIt produces more minification than spectacles in high myopiaCIt increases peripheral aberrationsDIt produces less image size distortion

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. It produces less image size distortion

Because a contact lens sits on the cornea, the vertex distance is zero and the magnification or minification is smaller than with spectacles. This benefits anisometropia and aphakia.

Option by option

A. It cannot be used after surgery
Contact lenses are widely used after surgery.
B. It produces more minification than spectacles in high myopia
Contact lenses cause less minification than spectacles in high myopia, so this is incorrect.
C. It increases peripheral aberrations
Peripheral aberrations are less with contact lenses.
D. It produces less image size distortion (correct)
Correct. Reduced image-size change is a key advantage.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is D, It produces less image size distortion. Because a contact lens sits on the cornea, the vertex distance is zero and the magnification or minification is smaller than with spectacles.

Why is "It cannot be used after surgery" not the answer?

Contact lenses are widely used after surgery.

Why is "It produces more minification than spectacles in high myopia" not the answer?

Contact lenses cause less minification than spectacles in high myopia, so this is incorrect.

Why is "It increases peripheral aberrations" not the answer?

Peripheral aberrations are less with contact lenses.

What concept does this question test?

It tests Optics: contact lens and spectacle in Ophthalmology. This benefits anisometropia and aphakia.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Optics: contact lens and spectacle?

Group the red eye by what to examine and what the pupil does. Then use the flashcards and the other Ophthalmology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.