Downward deviation of progressive addition lenses in a myopia control trial

Satoshi Hasebe, Chiaki Nakatsuka, Ichiro Hamasaki, Hiroshi Ohtsuki

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Purpose: To clarify how the downward deviation of progressive addition lenses (PALs) reduces their near-addition effect in schoolchildren participating in a myopia control trial. Methods: Among 95 schoolchildren wearing PALs for 6 months (age range: 6-12 years; refractive error range: -6.00 to -1.25 D), facial images were captured with a digital still camera placed 60 cm in front of the eyes while he or she was looking ahead with natural head posture. The vertical deviations of PALs from their ideal position (mm) were evaluated by analysing these images. Results: The mean (±SD) downward deviations of PALs for the right and left eyes were 3.7 ± 2.3 and 3.7 ± 2.0 mm, respectively, and the largest downward deviation was 10.2 mm. For simulations using the average downward deviation, the near-addition effect of PALs was reduced to 30 and 63% of the expected value at the 10° and 20° downward eye positions, respectively. Conclusions: The downward deviation of PALs is a significant factor in reducing their therapeutic effect for near-addition. To ensure the proper alignment of PALs in children, the conventional spectacle-frame-fitting procedure is not sufficient, and repeated confirmation using a testing method similar to that used in this study is required.

Original languageEnglish
Pages (from-to)310-314
Number of pages5
JournalOphthalmic and Physiological Optics
Volume25
Issue number4
DOIs
Publication statusPublished - Jul 1 2005

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Keywords

  • Lag of accommodation
  • Myopia control
  • Pediatric dispensing
  • Progressive addition lens

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry
  • Sensory Systems

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