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Effect of contact lens wear on central corneal thickness measurements
Dennis A Braun1, Ellen E Anderson Penno
1Gimbel Eye Centre, Calgary, Alberta, Canada.
Purpose:
To compare central corneal thickness measurements as a function of contact lens wear in patients presenting for refractive surgery.
Setting:
Gimbel Eye Centre, Saskatoon, Saskatchewan, Canada.
Methods:
A retrospective study of charts yielded 634 eyes meeting the inclusion criterion. Pachymetry measurements of spectacle-wearing control eyes were compared to those of full-time soft contact lens wearers and rigid gas-permeable contact lens wearers. All measurements were taken with the DGH ultrasonic pachymeter by a single observer.
Results:
Soft contact lens wearers had a mean reduction in corneal thickness measurements of 22 micrometers compared to the control population (P =.00001). Rigid gas-permeable lens wearers had a reduction of 24 micrometers compared to the control population (P =.00001).
Conclusion:
There was a clinically significant reduction in corneal thickness measurements associated with full-time contact lens wear.
