Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Automatic infrared refractors--a comparative study.

W Wesemann1, B Rassow

  • 1Medical Optics Laboratory, University of Hamburg, Federal Republic of Germany.

American Journal of Optometry and Physiological Optics
|August 1, 1987
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

[New DIN and ISO norms for determination of visual acuity].

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·2019
Same author

[Changes in the prevalence of myopia can be derived from prescription data of spectacle lenses].

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·2019
Same author

[Prevalence of spectacle wearers in Germany : Clear increase from 1952-2014].

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·2018
Same author

[Analysis of spectacle lens prescriptions shows no increase of myopia in Germany from 2000 to 2015].

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·2017
Same author

[Contrast vision-definitions, conversions, and equivalence tables].

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·2016
Same author

Light hazards to the patient's retina from ophthalmic instruments.

Applied optics·2010
Same journal

Visual decrement with deposit accumulation of HEMA contact lenses.

American journal of optometry and physiological optics·1988
Same journal

Stiles-Burch two-degree color mixture data.

American journal of optometry and physiological optics·1988
Same journal

Undercorrection and myopia development.

American journal of optometry and physiological optics·1988
Same journal

The International Optometric and Optical League.

American journal of optometry and physiological optics·1988
Same journal

Quantitative photorefraction using an off-center flash source.

American journal of optometry and physiological optics·1988
Same journal

An objective VER assessment of visual acuity compared with subjective measures.

American journal of optometry and physiological optics·1988
See all related articles

Seven automatic infrared refractors were tested. While accurate for most normal eyes, they showed errors in patients with intraocular lenses or other eye conditions, sometimes failing completely.

Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Device Technology

Background:

  • Automatic infrared (IR) refractors are widely used for objective eye measurements.
  • Understanding their performance across diverse patient populations is crucial for clinical application.

Purpose of the Study:

  • To evaluate the performance and accuracy of seven different automatic IR eye refractors.
  • To compare objective measurements from automatic refractors with subjective refractions in normal subjects.
  • To identify limitations and potential failure points in specific patient groups.

Main Methods:

  • Standardized measurements were performed on a model eye, 55 normal ametropic subjects, and patients with specific ocular conditions (e.g., intraocular lenses, aphakia, scattering media).
  • Comparison of automatic refraction results against conventional subjective eye examinations.

Related Experiment Videos

  • Analysis of measurement range, linearity errors, spherical equivalent, and cylinder power accuracy.

    • Main Results:

    • Model eye tests revealed smaller measurement ranges and linearity errors in several instruments.
    • In normal subjects, over 80% of spherical equivalent and 90% of cylinder power measurements were within 0.51 D of subjective results.
    • Significantly larger errors, or complete failure, occurred in patients with intraocular lenses, aphakia, or scattering eye media.

    Conclusions:

    • Automatic IR refractors demonstrate good accuracy for routine refractive error assessment in normal, ametropic eyes.
    • Performance degrades considerably in eyes with complex conditions, such as post-operative or pathological changes.
    • Clinical use requires careful consideration of patient-specific factors, as automatic refraction may be unreliable or impossible in certain cases.