Clinical evaluation of infrared autorefractors for use in contact lens over-refraction

Niall C. Strang*, Lyle S. Gray, Barry Winn, John R. Pugh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We examined the ability of autorefractors to provide an accurate means of contact lens over-refraction measurement. Over-refraction measures, performed using six commercially available automated infrared autorefractors and retinoscopy, were compared with subjective refraction. A total of 40 contact lens wearers (20 soft lens wearers and 20 rigid gas permeable (RGP) lens wearers) participated in the study. All six autorefractors were able to provide over-refraction measures in all subjects. Data analysis revealed differences in autorefractor performance between the two types of contact lens wearer with greater accuracy and lower variability being found in the soft lens wearing subjects compared with the RGP group. The level of agreement between retinoscopy and subjective over-refraction results was lower in soft lens wear and higher in RGP wear than the levels found between the autorefractor and subjective over-refraction measures. We conclude that autorefractors provide a useful means of measuring contact lens over-refraction in soft lens wearers. Over-refraction results should be treated more cautiously in RGP wearers.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalContact Lens and Anterior Eye
Issue number4
Publication statusPublished - Jan 1997


  • Autorefractor
  • Over-refraction
  • Rigid gas permeable lens
  • Soft contact lens

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry


Dive into the research topics of 'Clinical evaluation of infrared autorefractors for use in contact lens over-refraction'. Together they form a unique fingerprint.

Cite this