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Clin Exp Optom. 2009 May;92(3):267-73.

Dynamic wavefront aberrations and visual acuity in normal and dry eyes.

Author information

1
Shanghai Eye and ENT Hospital, Fudan University, Shanghai, China.

Abstract

PURPOSE:

The aim was to study the dynamic properties of wavefront aberrations and visual acuity in normal and dry eyes.

METHODS:

Thirty dry-eye patients and 27 normal subjects participated in this study. Multi-file mode of a Hartmann-Shack wavefront sensor was used to measure dynamic wavefront aberrations for a period of 45 seconds. Dynamic measurements of visual acuity (VA) were made for 150 seconds using a multi-functional VA tester. Standard deviation of the measurements (RMS or VA) over the testing period was used to estimate instability of the dynamic wavefront aberration and VA.

RESULTS:

For most subjects, both wavefront aberration and VA changed over time and the instability varied substantially among individuals. Blink-dependent fluctuation in wavefront aberration or VA was observed for some dry-eye subjects. On average, the dry-eye group had greater instability than the normal group in either the higher order wavefront aberrations (t = 2.09, p = 0.03, for OD; t = 3.76, p = 0.001, for OS) or the VA (t = 2.09,p = 0.02, for OD; t = 204, p = 0.03, for OS). Instability of VA in the dry-eye group was significantly correlated with blink rate (r = 0.28, p = 0.02).

CONCLUSION:

Dynamic changes in wavefront aberrations and VA are highly individual dependent, while the dry eye tends to be less stable than the normal eye. The results suggest that tear-film fluctuation might play a role in determining dynamic wavefront aberration and VA; however, contributions from other factors should not be overlooked. For dry eye, dynamic change in VA depends on blink rate.

PMID:
19469018
[Indexed for MEDLINE]

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