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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: Jun 4, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Lateral pupil alignment tolerance in peripheral refractometry.

Cathleen Fedtke1, Klaus Ehrmann, Arthur Ho

  • 1The Brien Holden Vision Institute, The University of New South Wales, Sydney, New South Wales, Australia. c.fedtke@brienholdenvision.org

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 15, 2011
PubMed
Summary
This summary is machine-generated.

Pupil alignment tolerance for accurate refraction is significantly lower in the periphery than centrally. Precise alignment is crucial for reliable peripheral refraction measurements.

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Last Updated: Jun 4, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

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Published on: September 16, 2025

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05:36

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Published on: October 18, 2024

Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Optics

Background:

  • Accurate refractive error measurement is essential for proper vision correction.
  • Peripheral refraction assessment can provide insights into visual function beyond the central visual field.
  • Understanding the impact of pupil alignment on refractive measurements is critical for device calibration and data interpretation.

Purpose of the Study:

  • To compare the tolerance to lateral pupil misalignment in peripheral refraction versus central refraction.
  • To determine the critical pupil alignment error thresholds for clinically significant refractive changes in both central and peripheral vision.

Main Methods:

  • A Shin-Nippon NVision-K5001 auto-refractor was used to measure central and peripheral refraction (30° temporal and 30° nasal) in emmetropic and myopic participants.
  • Refraction was recorded with varying lateral pupil alignments (0, ±1, ±2 mm from pupil center) at each fixation angle.
  • Refractive power vectors (M, J180, J45) were analyzed for changes related to pupil misalignment.

Main Results:

  • In central fixation, clinically significant refractive errors (≥0.25 D for M, ≥0.125 D for J180/J45) occurred with ≥0.79 mm pupil misalignment.
  • In peripheral fixation (30° temporal/nasal), a smaller pupil misalignment of ≥0.20 mm introduced clinically significant errors in M and J180.
  • A strong linear correlation was observed between pupil misalignment and refractive error changes in the periphery.

Conclusions:

  • Tolerance to lateral pupil misalignment is substantially reduced in peripheral refraction compared to central refraction.
  • Precise alignment of the entrance pupil with the instrument's optical axis is critical for obtaining accurate and reliable peripheral refraction data.
  • These findings highlight the importance of careful instrument setup and patient fixation for peripheral optical measurements.