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The presence of a contact lens induces a very small increase in the anterior corneal surface temperature
Author(s) -
Martin Donald K.,
Fatt Irving
Publication year - 1986
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1986.tb06964.x
Subject(s) - cornea , contact lens , lens (geology) , ophthalmology , materials science , anterior surface , optics , chemistry , anatomy , medicine , physics
The anterior corneal surface temperature beneath a contact lens covering the cornea was determined from measurements of the average heat flow from the cornea to the atmosphere (efflux) in a group of 13 healthy young subjects. The average heat efflux was 1.1 times 10 ‐2 cal.cm ‐1 .sec ‐1 . The mean corneal surface temperature of the same group was 34.5° for the open eye and 36.2° for the closed eye conditions. The anterior corneal surface temperature beneath a 0.07 mm thick hydrogel contact lens (40% water content) was found to be 34.6° (rise of 0.1°) and 34.9° (rise of 0.4°) beneath a 0.3 mm thick hydrogel contact lens (40% water content), using the measurement of corneal heat efflux and taking the contact lens to have a slight insulating effect. Contact lenses of higher water content caused a smaller rise in anterior corneal surface temperature than lenses of lower water content.