title: [Analysis of AC/A ratio after myopic excimer laser in situ keratomileusis].
abstract: OBJECTIVE
  To study the changes of AC/A ratio of myopia after excimer laser in situ keratomileusis (LASIK).
  
  
  METHODS
  135 myopia patients were treated by LASIK, their AC/A ratios were measured with synoptohore before surgery and 3 months after surgery.
  
  
  RESULTS
  The average AC/A ratios of naked eyes or eyes wearing glasses before surgery and the naked after surgery were (0.724 +/- 0.587) (Delta)/D, (2.754 +/- 1.565) (Delta)/D, (1.618 +/- 1.027) (Delta)/D in turn. There were significant difference among those groups (P < 0.001). That also appeared in different degree of myopia naked before surgery (P < 0.01). We found no significant difference between the groups wearing glasses before surgery and naked after surgery (P > 0.05). A positive correlation was built up between postoperative AC/A ratio and AC/A ratio of wearing glasses or refractive diopter before surgery (r = 0.550, P < 0.001; r = 0.185, P < 0.005). And the postoperative AC/A ratios had a negative correlation to age or length of ocular axis (r = -0.340, P < 0.001; r = -0.192, P < 0.002). The regression equation for postoperative AC/A ratios was figured out as Y((Delta)/D) = 4.080 0 - 0.031 8X(1) - 0.097 1X(2) + 0.325 0X(3) (P < 0.001). X(1) = age (year), X(2) = length of ocular axis (mm), X(3) = preoperative AC/A ratio with weaning glasses ((Delta)/D).
  
  
  CONCLUSIONS
  The naked AC/A ratios are higher than the preoperative's after LASIK, but lower than the wearing glasses's before surgery. It is influenced by the factors, such as: the preoperative AC/A ratio of wearing glasses, the length of ocular axis and the age.
authors.affiliation: Ophthalmic laser center, XiangYa Hospital, Central South University, Changsha 410008, China. xibuliadi@163.com
authors.forename: Xiao-ying
authors.initials: XY
authors.lastname: Wu
authors.forename: Shuang-zhen
authors.initials: SZ
authors.lastname: Liu
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008297:Male; D009216:Myopia / Q000503:physiopathology* / Q000601:surgery; D011182:Postoperative Care; D012029:Refraction, Ocular / Q000502:physiology*; D014792:Visual Acuity