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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 2.

Figure 2

Change in the magnitude of lower order wavefront aberrations (j indices 3 to 5) between pre-operative values and values at 1 month after myopic (A) and hyperopic (B) PRK in the cat. Note the significantly lower magnitude of defocus change (j=4) achieved by ablations over 6 versus 8mm optical zones (OZs). Defocus values for 6mm OZs were well below the intended defocus change (dotted line). No significant differences were observed for the amount of astigmatism change induced by either type of surgery. Values are expressed as means ± SD. N= number of eyes treated in each group.