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The measurement of the corneal ellipse for the contact lens practitioner
Author(s) -
Douthwaite William Arthur,
Sheridan Michael
Publication year - 1989
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 - 10.1111/j.1475-1313.1989.tb00900.x
Subject(s) - keratometer , contact lens , ellipse , optics , optometry , corneal topography , lens (geology) , ophthalmology , measure (data warehouse) , cornea , mathematics , physics , medicine , computer science , geometry , database
A keratometric instrument is described which can be used to measure the p ‐value of the corneal ellipse. The performance of the instrument is compared with that of the Guillbert Routit topographical keratometer and the Wesley Jessen P. E. K. The application of the p ‐value to contact lens fitting is discussed.