江西近视手术人群角膜前表面非球性参数调查分析

Objective To assess the distribution features of Q-value of corneal anterior surface in Jiangxi myopia population for laser refractive surgery and to investigate the relationship between Q-value and other related parameters, such as spherical equivalent (SE), corneal curvature, cornea astigmatism, wavefront data and age. Methods The K&Q calculator of Orbsean- Ⅱ anterior segment system was used to obtain the Q-value of 6 mm optical zone in 411 cases (822 eyes) .There were 188 male subjects (376 eyes) and 223 female subjects (446 eyes). Accnrding to SE, subjects were divided into three groups including low myopia, moderate myopia and high myopia. According to different age, subjects were divided into three groups including group Ⅰ (age from 17 to 25), group Ⅱ (age from 26 to 34) and group Ⅲ (age from 35 to 44). Statistical analysis was used to comprehend the distribution characters of Q-value and its relations with SE, corneal curvature, cornea astigmatism, wavefront data and age. Results The Q-value of 822 eyes (411 cases) distributed as positive normal distribution, the average of Q- value was -0.148± 0.120 (range from -0.73 to 0.56) and -0.130± 0.128for male subjects and -0.163± 0.110 for female ones with statistically significant difference in Q-value in different genders (t=4.069, P <0.01). A significant difference was observed in Q-value among 17-25 years, 26-34 years and 35-44 years groups (F =4.567, P <0.05) as well as between 26-34 years group and 35-44 years group (P =0.004). However, there was no significant difference found between different myopic groups (F =1.434, P >0.05). The Q-value shown significantly negative relationship with C12, the Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8. But the Q-value was not related with SE, RMSg, C7, cornea thickness, ocular pressure and age. Conclusions In Jiangxi myopia population for refractive surgery corneal curvature of majority population become flatter from center to periphery (Q<0), minority become steeper from center to periphery (Q>0). The Q-value of corneal anterior surface is independent from myopic SE. The Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8, C12 is the most important related factor of Q-value. The Q-value is significantly greater in males than in females. A significant difference is observed in Q-value between 26-34 years and 35-44 years group.

Investigation and analysis of Q value of corneal anterior surface in jiangxi myopia population for laser refractive surgery