Glare and halo with refractive correction.
BACKGROUND
The aim of this investigation was to compare glare and halo with various methods of refractive correction.


METHODS
Ninety-eight eyes of healthy pre-presbyopes were analysed for the presence of glare and halo using computer-generated stimuli. Subjects were divided into three groups: emmetropes without correction, single vision plastic lens spectacle wearers (with clean and dirty lenses) or single-vision soft contact lens wearers.


RESULTS
No significant difference in glare was found among groups. Significant differences were noted in halos between emmetropes and both contact lens (p<0.001) and uncleaned spectacle groups (p<0.05) but not with cleaned spectacles. The reduction in halo size after cleaning the lenses was significant (p<0.0187).


CONCLUSIONS
Contact lens and unclean spectacle wearers both have significantly larger halos than emmetropes and those wearing cleaned spectacle lenses. Unclean spectacles may affect the accuracy of results in psychophysical and clinical testing.
Allen
Richard J
RJ
Ophthalmology, Essex County Hospital, Colchester, United Kingdom. richardallen_@btopenworld
Saleh
George M
GM
Litwin
Andre S
AS
Sciscio
Andrea
A
Beckingsale
Adrian B
AB
Fitzke
Frederick W
FW
D000328:Adult; D000704:Analysis of Variance; D003261:Contact Lenses; D005139:Eyeglasses; D019466:Glare; D006801:Humans; D011305:Presbyopia / Q000503:physiopathology* / Q000628:therapy*; D012030:Refractive Errors / Q000628:therapy*; D014792:Visual Acuity