Ocular dimensions and refraction in tibetan children

Leon F. Garner, Keng Hung Maurice Yap, Robert F. Kinnear, Michael J. Frith

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

Abstract

A cross-sectional study of 404 Tibetan children (212 males, 192 females) aged 6 to 16 years was conducted in the Bouda region of Kathmandu, Nepal in April, 1992. Examination procedures included retinoscopy (1% cyclopentolate HCI), keratometry A-scan ultrasonography, and video ophthalmophakometry. The mean refractive error was +1.11 D (SD: 0.56 D) at age 6 years decreasing to +0.63 D (SD: 0.34 D) at age 16 years with a prevalence of myopia in this group of 3.9%. Most children examined had low refractive errors, with 95.5% having errors in the range -0.50 to + 1.50 D. Crystalline lens power decreased by 2.59 D, with an associated increase in its anterior radius of curvature of 1.98 mm and 0.49 mm in its posterior radius of curvature over the age range studied. Vitreous chamber depth increased by 0.69 mm, but no significant changes were recorded in anterior chamber depth, lens thickness, or corneal curvature. We conclude that the balance between the decrease in crystalline lens power and the increase in vitreous length is the major factor in maintaining the tendency to emmetropia in these children.
Original languageEnglish
Pages (from-to)266-271
Number of pages6
JournalOptometry and Vision Science
Volume72
Issue number4
DOIs
Publication statusPublished - 1 Jan 1995
Externally publishedYes

Keywords

  • Eye growth
  • Myopia
  • Ocular dimensions
  • Refractive error
  • Tibetan children

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry

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