Refraction: 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 · Refraction

Sample item

What optical defect causes myopia?

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

The answer and the reasoning

A. Parallel rays focus in front of the retina

In myopia, the eye is optically too powerful or too long, so distant rays focus before reaching the retina and distance vision blurs.

Option by option

  • A. Parallel rays focus in front of the retina (correct)

    Correct: anterior focal point produces myopic distance blur.

  • B. The cornea is completely opaque

    Corneal opacity is not a refractive error.

  • C. The optic nerve lacks blood supply

    Optic nerve ischaemia is not the mechanism of myopia.

  • D. Parallel rays focus behind the retina

    Posterior focus defines hyperopia.

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.

More Ophthalmology questions

Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is A, Parallel rays focus in front of the retina. In myopia, the eye is optically too powerful or too long, so distant rays focus before reaching the retina and distance vision blurs.

Why is "The cornea is completely opaque" not the answer?

Corneal opacity is not a refractive error.

Why is "The optic nerve lacks blood supply" not the answer?

Optic nerve ischaemia is not the mechanism of myopia.

Why is "Parallel rays focus behind the retina" not the answer?

Posterior focus defines hyperopia.

What concept does this question test?

It tests Refraction in Ophthalmology. The correct option holds because: Correct: anterior focal point produces myopic distance blur.

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 Refraction?

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.