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Analysis of corneal spherical aberration in patients before and after phacoemulsification
Zhao Hui Li1, Lie Xi Jia, Yi Fei Huang
1Department of Ophthalmology,Chinese PLA General Hospital,Beijing 100853,China.
Purpose:
To investigate the distribution and changes in corneal four-order spherical aberration Z40 in patients with age-related cataract before and after phacoemulsification, and to direct the application of aspherical intraocular lens (IOL) in PHACO combined with IOL implantation.
Methods:
A total of 155 eyes in 93 patients with age-related cataract were included. All patients received a comprehensive ophthalmologic examination. Corneal Z40 at a pupil diameter of 6 mm was measured by using a Scheimpflug photography system (Pentacam) preoperatively and 3 months postoperatively.
Results:
The mean corneal Z40 before and after the PHACO at a diameter of 6 mm was (0.294±0.138) μm and (0.271±0.130) μm, respectively, with statistical significance (P<0.05，t=4.384). There was no significant difference between male (n=45, 76 eyes) and female patients (n=48, 79 eyes) regarding corneal Z40 (t=-0.418, P=0.676). The corneal Z40 for patients (35 eyes) aged from 50 to 59 years was (0.238±0.104) μm preoperatively; (0.308±0.104) μm for 60 to 69 years; (0.332±0.151)μm for 70 to 79 years; and (0.307±0.164) μm for 80 to 89 years. A significant difference in Z40 was observed among different age groups. A linear positive correlation was noted between corneal Z40 and ages (r=0.203, P<0.003).
Conclusion:
The corneal Z40 varied significantly among cataract patients. Patients'corneal Z40, which should be considered when choosing aspherical IOL, increases slightly with age. Thus, customized aspheric IOLs are needed.
