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. Author manuscript; available in PMC: 2007 Sep 24.
Published in final edited form as: J Cataract Refract Surg. 2007 Jun;33(6):1051–1064. doi: 10.1016/j.jcrs.2007.02.021

Figure 7.

Figure 7

Effects of PRK on visco-elastic properties of the cat cornea and on intraocular pressure. Cats from all surgical groups (myopic and hyperopic PRK, over 6 and 8mm OZs) were combined for this analysis. A. Ablated corneas exhibited a significant decrease in corneal hysteresis (CH) 1month after PRK relative to pre-operative values, but they recovered towards normal values at 3 and 6 months post-operatively. B. The Corneal Resistance Factor (CRF) was lowest 1month post-PRK, recovering slowly over the next 5 months so that by 6 months post-operatively, it was not significantly different from pre-operative values. C. Corresponding histogram for Goldmann-like intraocular pressure measurements (IOPg) shows that PRK does not significantly change IOPg in cats. D. Similarly, cornea-compensated intraocular pressure (IOPcc) remained unchanged following PRK. Values are expressed as means ± SD. * = significant difference from pre-operative values at P<0.05 level, two-tailed Student’s t-test.