The magnitude and distribution of open-loop accommodation using three different methods of opening the loop

Lyle S. Gray*, Niall C. Strang, Nicola Winfield, Bernard Gilmartin, Barry Winn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Purpose. 

The present study examines the magnitude, distribution, and relationship of open-loop accommodation obtained using the three most common methods of opening the accommodation loop. 

Methods. 

Open-loop accommodation was measured in 93 young, emmetropic subjects using a Canon R1 objective infrared optometer, and the accommodation loop was opened using the following methods: (1) dark empty field (DA), (2) bright empty field (BA), and (3) viewing a target through a small artificial pupil (PA). 

Results. 

PA was found to elicit significantly (p = 0.0001) higher values of open-loop accommodation than either DA or BA and demonstrated a much wider distribution of values than DA or BA. A further experiment demonstrated that the higher PA was attributable to the proximal effect of placing a small artificial pupil close to the eye. 

Conclusion. 

Our results suggest that using a small artificial pupil to open the accommodation loop may not produce a veridicial measure of open-loop accommodation.

Original languageEnglish
Pages (from-to)897-902
Number of pages6
JournalOptometry and Vision Science
Volume75
Issue number12
DOIs
Publication statusPublished - Dec 1998

Keywords

  • Bright-field
  • Darkness
  • Pinhole
  • Spatiotopic
  • Tonic accommodation

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry

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