title: Correlation between ocular biometry and amplitude of accommodation in early presbyopia.
abstract: OBJECTIVE
  To determine the correlation between ocular biometric parameters and the amplitude of accommodation in early presbyopic eyes.
  
  
  METHODS
  This cross-sectional study was performed on 62 eyes of 62 subjects aged from 40 to 49 years. All participants were emmetropic (spherical equivalent refractive error within 0.50 D of emmetropia with astigmatism less than 0.75 D) and best spectacle-corrected visual acuity was 20/20. Only the right eyes of all subjects were included for analysis. In all subjects a complete ophthalmologic examination was performed and the amplitude of accommodation (AA) was measured by two methods: method of spheres and push-up test. Optical biometry was performed using Lenstar® (Haag-Streit AG, Koeniz, Switzerland) and keratometry (KR), anterior chamber depth (corneal epithelium to lens) (ACD), lens thickness (LT), vitreous length (VL), and axial length (AL) were measured before and after cycloplegia.
  
  
  RESULTS
  Mean age of the study participants was 44 ± 2 years and 36 subjects (58%) were men. Mean AA was 3.29 ± 1.36 D. There were statistically significant differences between ACD, LT, and AL values measured before and after cycloplegia. There was no significant correlation between AA and any biometric parameter measured by Lenstar using univariate and multivariate analysis.
  
  
  CONCLUSIONS
  According to this study, there seems to be no correlation between KR, ACD, LT, VL, and AL with AA in early presbyopic eyes.
authors: Ophthalmic Research Center and Department of Ophthalmology, Labbafinejad Medical Center, Shahid Beheshti Medical University, Tehran - Iran.
authors: Amir
authors: A
authors: Faramarzi
authors: Abbas
authors: A
authors: Bagheri
authors: Farid
authors: F
authors: Karimian
authors: Halimeh
authors: H
authors: Shaianfar
authors: Mohammad Reza
authors: MR
authors: Razzaghi
authors: Shahin
authors: S
authors: Yazdani
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000328:Adult; D000867:Anterior Chamber / Q000473:pathology; D058452:Axial Length, Eye / Q000473:pathology; D001699:Biometry; D063171:Corneal Pachymetry; D003430:Cross-Sectional Studies; D058453:Emmetropia / Q000502:physiology; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D011305:Presbyopia / Q000503:physiopathology*; D014792:Visual Acuity / Q000502:physiology