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Axial, instantaneous, and refractive formulas in computerized videokeratography of normal corneas.

Abstract：

PURPOSE:To compare the values for corneal power determined by the axial, instantaneous and refractive formulas when imaging normal human corneas using computerized videokeratography. SETTING:Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. METHODS:This prospective clinical trial involved 60 corneas of 30 normal volunteers. Computerized videokeratography was performed to determine corneal power at the center and the 1, 3, 5, and 7 mm zones using the 3 formulas. RESULTS:Mean central corneal power was 42.86 diopters (D) with each of the formulas. The mean corneal powers for the axial, instantaneous, and refractive formulas were 43.09, 43.21, and 42.98 D at the 1 mm zone; 43.10, 42.92, and 43.46 D at the 3 mm zone; 42.75, 41.63, and 44.02 at the 5 mm zone; 42.21, 40.30, and 44.79 D at the 7 mm zone, respectively. The differences among powers for the 3 formulas at the 3, 5, and 7 mm zones were statistically significant (P < .01). CONCLUSION:In normal corneas, clinically significant differences exist in the corneal power values calculated by the axial, instantaneous, and refractive formulas.

journal_name

J Cataract Refract Surg

journal_title

Journal of cataract and refractive surgery

authors

Bafna S,Kohnen T,Koch DD

doi

10.1016/s0886-3350(98)80009-6

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

1184-90

issue

9

eissn

0886-3350

issn

1873-4502

pii

S0886-3350(98)80009-6

journal_volume

24

pub_type

临床试验,杂志文章

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