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Objectively determined refraction improves peripheral vision.

Peter Lewis1, Karthikeyan Baskaran, Robert Rosén

  • 1*BOptom †PhD ‡PhD, FAAO Department of Medicine and Optometry, Linnæus University, Kalmar, Sweden (PL, KB, JG); and Biomedical and X-Ray Physics, KTH, Royal Institute of Technology, Stockholm, Sweden (RR, LL, PU).

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

Correcting off-axis refractive errors, particularly astigmatism, significantly improves peripheral low-contrast visual acuity. This fast clinical method using wavefront aberrometry is beneficial for patients needing optimal visual function.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Off-axis refractive errors can impact visual acuity, especially in the periphery.
  • Accurate measurement of off-axis refraction is crucial for comprehensive vision correction.

Purpose of the Study:

  • To validate a rapid, clinically applicable method for determining off-axis refraction.
  • To evaluate the effect of objectively corrected off-axis refractive errors on peripheral low-contrast visual acuity.

Main Methods:

  • Peripheral low-contrast acuity was measured using Gabor patches in 10 emmetropic subjects.
  • Off-axis correction was achieved using a COAS-HD VR Hartmann-Shack wavefront sensor.
  • Off-axis refractive errors were calculated using the 'Seidel sphere' method.

Main Results:

  • Off-axis astigmatism, primarily simple myopic astigmatism, was prevalent in the nasal visual field.
  • Correcting off-axis errors improved mean low-contrast resolution acuity by 0.06 logMAR.
  • Improvements were strongly correlated with the degree of off-axis astigmatism and refractive error.

Conclusions:

  • Correcting moderate off-axis refractive errors, including astigmatism, offers significant visual acuity benefits.
  • This technique is particularly relevant for individuals requiring optimal peripheral vision, such as those with central visual field loss.
  • Open-field aberrometry provides a clinically useful tool for rapid off-axis refraction assessment.