Tonometry MCQ Quiz | Clinical Skills & Procedures

Welcome to the Tonometry MCQ Quiz, an essential module for MBBS students focusing on Clinical Skills & Procedures. This quiz is designed to rigorously test your understanding of the principles, techniques, and clinical applications of intraocular pressure measurement. You will encounter 25 multiple-choice questions covering topics from the foundational Imbert-Fick law to the practical nuances of Goldmann, Schiøtz, and non-contact tonometers. Assess your knowledge on indications, contraindications, sources of error, and result interpretation. Upon completion, you can submit your answers to receive your score and a detailed review of your performance with correct answers highlighted. For your future reference and study, an option to download all questions and their correct answers in a PDF format is also available.

1. The Goldmann Applanation Tonometer (GAT) operates based on which principle?

2. What is considered the normal range for intraocular pressure (IOP) in the adult population?

3. A thicker Central Corneal Thickness (CCT) is known to cause what kind of error in Goldmann tonometry readings?

4. The Schiøtz tonometer is an example of which type of tonometry?

5. Which of the following is an absolute contraindication for performing contact tonometry?

6. What is the ideal appearance of the fluorescein mires at the endpoint of a Goldmann tonometry measurement?

7. Non-contact tonometry (NCT) or “air-puff” tonometry estimates IOP by measuring:

8. Which local anesthetic is most commonly used prior to contact tonometry?

9. What is the standard diameter of the corneal area flattened by a Goldmann tonometer?

10. The Perkins tonometer is best described as a:

11. If the fluorescein mires in GAT are too thick or wide, what is the most likely cause?

12. Which of the following factors can cause a transient INCREASE in intraocular pressure?

13. The Tono-Pen is particularly useful in which clinical scenario?

14. What is the recommended method for disinfecting the Goldmann tonometer prism tip between patients?

15. High regular corneal astigmatism (>3 Diopters) can affect GAT readings. How is this error minimized?

16. The pulsatile movement of mires seen during GAT corresponds to:

17. Which tonometer is less affected by corneal properties like thickness and biomechanics compared to GAT?

18. A potential iatrogenic complication of performing contact tonometry is:

19. Schiøtz tonometry readings can be significantly inaccurate in eyes with abnormal:

20. What is the primary purpose of the cobalt blue filter on the slit lamp during Goldmann tonometry?

21. A patient with a thin cornea (e.g., post-LASIK) is likely to have a GAT reading that is:

22. The force applied by the Goldmann tonometer is measured in grams. The reading on the dial is converted to mmHg by:

23. Holding one’s breath or a tight collar can artifactually raise IOP readings. This is primarily due to:

24. Which tonometer would be most appropriate for a mass screening event for glaucoma?

25. The Imbert-Fick Law (P = F/A) assumes the cornea is: