Differences in the accommodation stimulus response curves of adult myopes and emmetropes: a summary and update

Katrina Schmid, Niall Strang

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To provide a summary of the classic paper "Differences in the accommodation stimulus response curves of adult myopes and emmetropes" published in Ophthalmic and Physiological Optics in 1998 and to provide an update on the topic of accommodation errors in myopia. Summary: The accommodation responses of 33 participants (10 emmetropes, 11 early onset myopes and 12 late onset myopes) aged 18-31 years were measured using the Canon Autoref R-1 free space autorefractor using three methods to vary the accommodation demand: decreasing distance (4 m to 0.25 cm), negative lenses (0 to -4 D at 4 m) and positive lenses (+4 to 0 D at 0.25 m). We observed that the greatest accommodation errors occurred for the negative lens method whereas minimal errors were observed using positive lenses. Adult progressing myopes had greater lags of accommodation than stable myopes at higher demands induced by negative lenses. Progressing myopes had shallower response gradients than the emmetropes and stable myopes; however the reduced gradient was much less than that observed in children using similar methods. Recent Findings: This paper has been often cited as evidence that accommodation responses at near may be primarily reduced in adults with progressing myopia and not in stable myopes and/or that challenging accommodation stimuli (negative lenses with monocular viewing) are required to generate larger accommodation errors. As an analogy, animals reared with hyperopic errors develop axial elongation and myopia. Retinal defocus signals are presumably passed to the retinal pigment epithelium and choroid and then ultimately the sclera to modify eye length. A number of lens treatments that act to slow myopia progression may partially work through reducing accommodation errors.
Original languageEnglish
Pages (from-to)613-621
Number of pages9
JournalOphthalmic and Physiological Optics
Volume35
Issue number6
Early online date23 Oct 2015
DOIs
Publication statusPublished - Nov 2015

Keywords

  • classic paper
  • myopia
  • accommodation errors

Fingerprint

Dive into the research topics of 'Differences in the accommodation stimulus response curves of adult myopes and emmetropes: a summary and update'. Together they form a unique fingerprint.

Cite this