Glaucoma: Schiotz: 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 · Glaucoma: Schiotz

Sample item

In Schiotz tonometry, which factor leads to a falsely low IOP reading?

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

The answer and the reasoning

B. Low scleral rigidity as in high myopia

Schiotz measures indentation, so a soft sclera permits more indentation and a higher scale reading, which converts to a lower IOP. High scleral rigidity gives falsely high pressure.

Option by option

  • A. High scleral rigidity

    High rigidity overestimates pressure.

  • B. Low scleral rigidity as in high myopia (correct)

    Correct. Low rigidity underestimates IOP.

  • C. Patient looking upward

    Positioning has a minor effect compared with rigidity.

  • D. Thick cornea

    A thick cornea affects applanation measurement, not primarily Schiotz.

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 B, Low scleral rigidity as in high myopia. Schiotz measures indentation, so a soft sclera permits more indentation and a higher scale reading, which converts to a lower IOP.

Why is "High scleral rigidity" not the answer?

High rigidity overestimates pressure.

Why is "Patient looking upward" not the answer?

Positioning has a minor effect compared with rigidity.

Why is "Thick cornea" not the answer?

A thick cornea affects applanation measurement, not primarily Schiotz.

What concept does this question test?

It tests Glaucoma: Schiotz in Ophthalmology. High scleral rigidity gives falsely high pressure.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Glaucoma: Schiotz?

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.