title: Measurement of amplitude of accommodation in young persons.
abstract: BACKGROUND
  The aim was to evaluate the amplitude of accommodation using test objects designed with constant angular size corresponding to 6/6 visual acuity.
  
  
  METHODS
  In total, 155 young volunteers with good ocular and systemic health aged between eight and 25 years were recruited for the study. A push-up method was conducted, with the near-vision target having a set of Landolt's broken circles. The angular size of the circles corresponded to a 6/6 visual acuity for various distances from 5.0 cm to 40 cm. To ensure precision of the object size, the electron beam lithographic technique was applied.
  
  
  RESULTS
  A general trend in a reduction in amplitude with the progression of age is coincident with data from previous studies; however, the magnitudes of the volume of accommodation in our study are substantially lower.
  
  
  CONCLUSIONS
  Test objects with constant angular size can increase the accuracy of 'push-up' accommodation measures.
authors.affiliation: Department of ophthalmology, National Medical Academy of Postgraduate Education, Kiev, Ukraine. nmsmicro@gmail.com.
authors.forename: Nikolai M
authors.initials: NM
authors.lastname: Sergienko
authors.affiliation: Department of ophthalmology, National Medical Academy of Postgraduate Education, Kiev, Ukraine.
authors.forename: Dmitry P
authors.initials: DP
authors.lastname: Nikonenko
mesh_terms: D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D006801:Humans
keywords: constant size target; near point of clear vision; near-vision charts; proximeter; push-up method; volume of accommodation