What question did this study set out to answer?

To compare intraocular pressure measurements from non-contact tonometry and Mackay-Marg tonometry.

March 21, 2026

Non‐contact and Mackay‐Marg Tonometry

Key Points

To compare intraocular pressure measurements from non-contact tonometry and Mackay-Marg tonometry.
Compared IOP measurements in 212 eyes using both NCT and Mackay-Marg tonometer.
Collected data on 987 eyes in a general optometry clinic using NCT.
Analyzed the average IOP across different age groups.
Strong correlation of +0.91 between NCT and Mackay-Marg tonometer IOP measurements.
NCT measured IOP lower by an average of 6.5 mm Hg.
Mean IOP with NCT was 15.7 mm Hg for the clinic sample, with a standard deviation of 3.5 mm Hg.

Abstract

ABSTRACT In a sample of 212 eyes of patients referred to an ocular pathology clinic, measures of intraocular pressure (IOP) using the non‐contact tonometer (NCT) and the Mackay‐Marg tonometer were highly correlated (+0.91), the NCT measures being lower by an average of 6.5 mm Hg. In a general optometry clinic, the mean IOP as measured with the NCT on 987 eyes of patients, ages 7 to 85 years, was 15.7 mm Hg (S.D. = 3.5 mm Hg). Stability of IOP was age, found for this sample, is unexpected if IOP is proportional to systemic blood pressure which rises with age. Several hypotheses propose to explain the apparent inconsistency.

AI에게 질문

Bookmark

Cite This Study

Augsburger et al. (Sat,) studied this question.

synapsesocial.com/papers/69be372b6e48c4981c676ad0 https://doi.org/https://doi.org/10.1002/j.2330-9512.1977.tb02256.x

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

AI에게 질문

Bookmark