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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 25, 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

Accommodative lag by autorefraction and two dynamic retinoscopy methods.

, Ruth E Manny, Danielle L Chandler

    Optometry and Vision Science : Official Publication of the American Academy of Optometry
    |February 14, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Neither Monocular Estimate Method (MEM) nor Nott retinoscopy effectively detected significant accommodative lag in myopic children. These clinical procedures showed inadequate sensitivity and specificity when compared to autorefraction, a more accurate diagnostic tool.

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    Last Updated: Jun 25, 2026

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    Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

    Published on: March 3, 2023

    Area of Science:

    • Ophthalmology
    • Pediatric Optometry
    • Vision Science

    Background:

    • Accommodative lag, a condition where the eye's focus does not fully adjust to near vision demands, is common in children with myopia.
    • Accurate detection of accommodative lag is crucial for timely intervention and management of myopia progression.
    • Clinical methods like Monocular Estimate Method (MEM) and Nott retinoscopy are traditionally used, but their efficacy in identifying significant lags needs validation.

    Purpose of the Study:

    • To assess the diagnostic accuracy of Monocular Estimate Method (MEM) and Nott retinoscopy in identifying accommodative lags of 1.00 diopter (D) or greater in children.
    • To compare the sensitivity and specificity of MEM and Nott retinoscopy against an open-field autorefractor, considered the gold standard.

    Main Methods:

    • 168 children aged 8 to <12 years with low myopia underwent testing.
    • Accommodative response was measured using MEM and Nott retinoscopy, with examiners masked to results.
    • An open-field autorefractor was used as the gold standard to determine the presence of accommodative lag (≥1.00 D).

    Main Results:

    • 69% of children exhibited accommodative lag of 1.00 D or more as per autorefraction.
    • MEM showed 57% sensitivity and 63% specificity for detecting significant accommodative lag.
    • Nott retinoscopy demonstrated 30% sensitivity and 81% specificity, indicating poor detection rates.

    Conclusions:

    • Both MEM and Nott retinoscopy are inadequate for reliably identifying myopic children with significant accommodative lag (≥1.00 D).
    • The study highlights discrepancies between traditional retinoscopy methods and autorefraction, suggesting methodological differences impact agreement.
    • Further research into improved clinical techniques for assessing accommodative function in pediatric myopia is warranted.