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Human tear film pre‐rupture phase time (TP‐RPT)‐A non‐invasive technique for evaluating the pre‐corneal tear film using a novel keratometer mire
Author(s) -
Hirji Nizar,
Patel Sudi,
Callander Murchison
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.tb00833.x
Subject(s) - keratometer , mire , ophthalmology , medicine , optometry , optics , cornea , materials science , biology , physics , ecology , peat
A non‐invasive method of assessing the stability of the human pre‐corneal tear film is described using a novel keratometer mire designed in the form of a grid pattern (HIR‐CAL Grid). In a laboratory environment, the technique measures with ease and little variability the time taken for the tear film to loose stability and enter the pre‐rupture phase (TP‐RPT) before rupturing (BUT). This technique may prove useful in evaluating the stability or otherwise of the pre‐corneal tear film of prospective contact lens wearer and the pre‐contact lens tear film stability on differing current and new contact lens materials.