title: Changes in refraction and ocular dimensions after cataract surgery and primary intraocular lens implantation in infants.
abstract: OBJECTIVE
  To study refraction and axial length changes after cataract extraction and primary intraocular lens (IOL) implantation in children younger than 1 year of age.
  
  
  METHODS
  Two regional hospitals.
  
  
  METHODS
  After determining the IOL power for emmetropia, 80% of the value was used to choose the IOL for implantation to counter anticipated myopic shift with age. The main outcome measures were changes in refraction and axial length 3 years after surgery.
  
  
  RESULTS
  Thirty-four eyes of 20 children (mean age 6.7 months +/- 3.9 [SD]) were studied. Refraction in the immediate postoperative period was +4.53 +/- 1.45 diopters (D). Three years after surgery, the mean refraction was -2.49 +/- 3.08 D (P<.001). Twenty-two eyes (64.7%) had surgery during the first 6 months of life (group 1) and had a shorter axial length at surgery (mean 18.92 +/- 1.32 mm) compared with 12 eyes (35.3%) that received surgery between 7 and 12 months (group 2, mean 20.29 +/- 1.00 mm) (P = .007). However, the final axial length was greater in group 1 (mean 22.67 +/- 1.04 mm) than in group 2 (mean 21.23 +/- 0.26 mm) (P = .019).
  
  
  CONCLUSIONS
  Primary IOL implantation is an option for children having cataract surgery in the first year of life. Significant myopic shifts occurred, and this seemed to be more pronounced in younger children. It appears that rethinking current strategies for IOL power calculation may be required to achieve more optimal refractive outcomes.
authors.affiliation: Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong Eye Hospital, Kowloon, Hong Kong, China.
authors.forename: Dorothy S P
authors.initials: DS
authors.lastname: Fan
authors.forename: Srinivas K
authors.initials: SK
authors.lastname: Rao
authors.forename: Christopher B O
authors.initials: CB
authors.lastname: Yu
authors.forename: C Y
authors.initials: CY
authors.lastname: Wong
authors.forename: Dennis S C
authors.initials: DS
authors.lastname: Lam
mesh_terms: D002386:Cataract / Q000151:congenital; D002387:Cataract Extraction; D005123:Eye / Q000033:anatomy & histology* / Q000254:growth & development; D006801:Humans; D007223:Infant; D019654:Lens Implantation, Intraocular; D009216:Myopia / Q000209:etiology; D011183:Postoperative Complications; D019591:Pseudophakia / Q000503:physiopathology*; D012029:Refraction, Ocular / Q000502:physiology*