Non-contact air-puff tonometry (NCT) compared to Goldmann applanation tonometry (GAT) is characterised by all EXCEPT:
- A It does not require topical anaesthesia
- B It is more affected by central corneal thickness variation
- C It is the gold standard for clinical IOP measurement ✓
- D It is useful for screening large populations
Correct answer: C. It is the gold standard for clinical IOP measurement
Explanation
Goldmann applanation tonometry (GAT) is the gold standard for clinical IOP measurement, not NCT. NCT uses a puff of air to applanate the cornea and is contact-free (no anaesthesia needed), making it suitable for population screening. Both NCT and GAT are affected by corneal rigidity and central corneal thickness (CCT), but GAT is considered more accurate in clinical practice. NCT is less repeatable and tends to overestimate IOP at higher levels.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.