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J Cataract Refract Surg. 2010 Jan;36(1):82-6. doi: 10.1016/j.jcrs.2009.07.038.

Clinical relevance of radius of curvature error in corneal power measurements after excimer laser surgery.

Author information

1
GB Bietti Eye Foundation-IRCCS, Rome, Italy. giacomo.savini@alice.it

Abstract

PURPOSE:

To compare central and paracentral corneal curvature measurements after myopic excimer laser surgery performed using a large optical zone (OZ) (6.5mm).

SETTING:

Private practice.

METHODS:

The mean simulated keratometry (SimK) value, average central power, corneal power of Placido rings 1 to 9 and the average central corneal power over the central 3.0mm (ACCP(3mm)) were measured using a TMS-2 corneal topographer.

RESULTS:

Forty-two patients (mean correction -5.0 diopters [D]+/-2.2 [SD]) were prospectively enrolled. The mean SimK value (38.82 D+/-1.95) and the mean average central power (38.89+/-2.02 D) were not statistically significantly different, even when the sample was stratified according to the amount of induced correction (lower or higher than -5.00 D). The difference between the central and paracentral measurements was statistically significant when considering the ACCP(3mm), whose mean value was lower than the SimK value in eyes with a myopic correction less than -5.00 D (mean 39.53+/-1.92 D versus 39.67+/-1.82 D) (P=.0013) and in eyes with a myopic correction greater than -5.00 D (37.64+/-1.75 D versus 37.9+/-1.69 D) (P<.0001).

CONCLUSIONS:

In eyes with a large OZ, the clinical relevance of the radius error was limited, especially with myopic corrections less than -5.00 D. The mean difference between central and paracentral corneal curvature data, although more evident, was still relatively small, even in eyes that were treated for more than -5.00 D of myopia.

FINANCIAL DISCLOSURE:

No author has a financial or proprietary interest in any material or method mentioned.

PMID:
20117709
DOI:
10.1016/j.jcrs.2009.07.038
[Indexed for MEDLINE]

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