Lens: problems with aphakic spectacles: 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 · Lens: problems with aphakic spectacles

Sample item

Which set of problems is associated with high plus aphakic spectacles?

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

The answer and the reasoning

C. Magnification, ring scotoma and pincushion distortion

Aphakic glasses magnify images by about 25 to 30 percent, cause a ring scotoma from the prismatic effect of the thick lens edge, and give pincushion distortion and jack-in-the-box phenomenon. Contact lenses and IOLs avoid these problems.

Option by option

  • A. Minification, central scotoma and barrel distortion

    Plus lenses magnify, not minify.

  • B. No change in image size, but glare

    There is significant image magnification.

  • C. Magnification, ring scotoma and pincushion distortion (correct)

    Correct. These are the classic problems.

  • D. Diplopia and aniseikonia only

    Aniseikonia is a problem in unilateral aphakia but is not the only one.

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.

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Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is C, Magnification, ring scotoma and pincushion distortion. Aphakic glasses magnify images by about 25 to 30 percent, cause a ring scotoma from the prismatic effect of the thick lens edge, and give pincushion distortion and jack-in-the-box phenomenon.

Why is "Minification, central scotoma and barrel distortion" not the answer?

Plus lenses magnify, not minify.

Why is "No change in image size, but glare" not the answer?

There is significant image magnification.

Why is "Diplopia and aniseikonia only" not the answer?

Aniseikonia is a problem in unilateral aphakia but is not the only one.

What concept does this question test?

It tests Lens: problems with aphakic spectacles in Ophthalmology. Contact lenses and IOLs avoid these problems.

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 Lens: problems with aphakic spectacles?

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.