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Related Experiment Videos

Comparison between MEM and Nott dynamic retinoscopy.

M del Pilar Cacho1, A García-Muñoz, J R García-Bernabeu

  • 1Departamento Interuniversitario de Optica, Universidad de Alicante, Spain.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 25, 1999
PubMed
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The study found that Modified Monocular Estimation (MEM) dynamic retinoscopy shows a greater accommodative lag than the Nott method. A linear relationship exists between the two techniques for assessing visual function.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accurate assessment of accommodative response is crucial for understanding visual function.
  • Dynamic retinoscopy techniques, such as MEM and Nott, are used to measure accommodative lag.

Purpose of the Study:

  • To compare Modified Monocular Estimation (MEM) dynamic retinoscopy with the Nott method.
  • To determine differences in accommodative response measurements between the two techniques.
  • To investigate the relationship between MEM and Nott dynamic retinoscopy.

Main Methods:

  • MEM and Nott dynamic retinoscopy were performed on 50 visually normal university students.
  • Both methods were applied using static retinoscopy and subjective refractive exam (binocular balancing) as a basis.

Related Experiment Videos

  • Accommodative lag was quantified for each method.

    • Main Results:

    • A statistically significant difference in accommodative lag was observed between MEM and Nott methods.
    • Nott retinoscopy based on the subjective refractive exam yielded the lowest accommodative lag (+0.42 D).
    • MEM dynamic retinoscopy based on static retinoscopy showed the highest accommodative lag (+0.94 D).

    Conclusions:

    • MEM dynamic retinoscopy consistently demonstrated a greater accommodative lag compared to the Nott method.
    • A linear correlation was found between the two retinoscopy techniques, with Nott values approximating half of MEM values.