In Goldmann applanation tonometry, the mire half-circles are wider than the standard when the tear film fluorescein concentration is excessively high (over-fluorescein). The correct adjustment to achieve accurate IOP measurement is to:

• A Blot excess fluorescein from the fornices before measuring ✓
• B Increase the dial reading to widen the inner mire edges
• C Use a cobalt blue-free light source
• D Increase the counterweight to reduce applanation force

Explanation

Excessive fluorescein creates a wide tear meniscus around the applanation prism, causing the mire half-circles to appear too wide, falsely elevating IOP readings. Blotting excess fluorescein from the cul-de-sac restores the standard thin fluorescein ring. Adjusting the dial reading without correcting the mire thickness introduces error. The light source and counterweight do not correct fluorescein concentration.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.