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Keratometric variation: the influence of a fluid layer
Author(s) -
CronjeDunn S.,
Harris W. F.
Publication year - 1996
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1996.95001174.x
Subject(s) - variation (astronomy) , polymethyl methacrylate , coefficient of variation , optics , covariance , materials science , layer (electronics) , variance (accounting) , mathematics , ophthalmology , composite material , physics , statistics , medicine , polymer , astrophysics , accounting , business
Summary Variation of keratometric measurements on an approximately spherical surface on a polymethyl methacrylate (PMMA) button is compared to keratometric variation on the PMMA button after the application of an artificial tear solution. The variation is shown by means of scatter plots in a three‐dimensional space, as well as quantitatively in the form of variance‐covariance matrices. The wet button showed variances a factor of more than 1000 times that of the dry button. This suggests that the precorneal tear film could be an important, often‐overlooked contributing factor to keratometric variation in the case of the eye.