Polar value analysis of refractive data.

Abstract:

PURPOSE:To demonstrate the use of polar value analysis of surgically induced astigmatism (SIA). SETTING:Department of Ophthalmology, Arhus University Hospital, Arhus, Denmark. METHODS:Univariate polar value analysis of SIA was demonstrated for a single patient and for aggregate data. Bivariate polar value analysis was performed for aggregate data. RESULTS:The meridional polar value AKP expresses the surgically induced flattening, while the oblique polar value AKP(+45) indicates the torque. This pair of polar values characterizes a regular astigmatism completely. In bivariate polar value analysis, the average SIA is the combined mean for AKP and AKP(+45), while the spread is a confidence area delineated by an ellipse. CONCLUSIONS:Univariate and bivariate polar value analyses, together with the surgically induced change in spherical equivalent power, yield an exact description of surgically induced change following refractive procedures.

authors

Naeser K,Hjortdal J

doi

10.1016/s0886-3350(00)00799-9

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

86-94

issue

1

eissn

0886-3350

issn

1873-4502

pii

S0886-3350(00)00799-9

journal_volume

27

pub_type

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