Refractive state, depth of focus and accommodation of the eye of the California ground squirrel (Spermophilus Beecheyi)

Mark E. Mccourt, Gerald H. Jacobs

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Retinoscopy and electrophysiological refraction were performed on 55 and 24 faraccommodated eyes of California ground squirrels (Spermophilus beecheyi), respectively. These two indices were highly correlated, revealing the eye of this animal to be roughly emmetropic (-0.25 to -0.13 D). Depth of focus was assessed by measuring the effect which defocusing produced on the spatial resolving power of 32 optic nerve fibers. Depth of focus of the ground squirrel eye for a pupil diameter of 2.5 mm is estimated to be ± 1.6 D, but will increase rapidly for smaller pupils. Accommodation in eleven ground squirrels ranged from 2 to 6 D, with a mean value of 3.9 D.

Original languageEnglish (US)
Pages (from-to)1261-1266
Number of pages6
JournalVision research
Volume24
Issue number10
DOIs
StatePublished - 1984

Keywords

  • Accommodation
  • Depth of focus
  • Ground squirrel
  • Refractive state
  • Retinoscopy
  • Single-unit

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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