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Abstract #6695 Published in IGR 4-1
Axial length in applanation tonometry
Mark HH; Robbins KP; Mark TLJournal of Cataract and Refractive Surgery 2002; 28: 504-506
PURPOSE: To investigate the clinical applicability of a physical principle that suggests that a large globe offers less resistance to applanation than a smaller one. METHODS: The correlation between axial length and applanation tonometry in 513 adult eyes, arbitrarily chosen from a referral practice, was examined using regression analysis. RESULTS: A statistically significant negative correlation was found; that is, for every 1.0 mm increase in axial length, the tonometry value was 0.29 units lower (p = 0.0002) In females, the mean axial length was 1.04 mm shorter and the mean intraocular pressure 0.54 mmHg higher than in males. CONCLUSIONS: Globe size influence applanation tonometry readings. Hence, when the tonometry record does not fit the clinical findings, length measurement may help interpret its significance.
Dr HH Mark, 2 Church Street South, New Haven, CT 06519-1717, USA iimd@aolcom
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
