Postblink changes in the ocular modulation transfer function measured by a double-pass method.
OBJECTIVE
To examine the temporal changes in the modulation transfer function (MTF) of the eye after a blink.


METHODS
The distance MTF of a 5-mm pupil was derived from double-pass retinal images in 20 healthy young subjects at various intervals after a blink (1 second up to 15 seconds). Such measurements include the effects of wavefront aberration, scattered light, and errors in focus and are thus more relevant to real life than are estimates of MTF based on wavefront errors alone.


RESULTS
Optimal MTF by a variety of criteria was found some 6 seconds after a blink.


CONCLUSIONS
Inclusion of the effects of stray light and errors of focus does not affect the finding that optimal retinal image quality occurs some time after a blink. It does not appear that a loss in optical quality is the trigger of normal blinking.
Montés-Micó
Robert
R
Research, Development and Innovation Department, VISSUM Ophthalmologic Institute of Alicante, Alicante, Spain. roberto-montes@uv.es
Alió
Jorge L
JL
Charman
W Neil
WN
D000065:Accommodation, Ocular / Q000502:physiology; D000328:Adult; D001767:Blinking / Q000502:physiology*; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D008297:Male; D009799:Ocular Physiological Phenomena; D011680:Pupil / Q000502:physiology; D012160:Retina / Q000502:physiology*; D013997:Time Factors; D014785:Vision, Ocular / Q000502:physiology*