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Focusing of Light in the Eye01:16

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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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Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
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Repeatability of peripheral aberrations in young emmetropes.

Karthikeyan Baskaran1, Baskar Theagarayan, Staffan Carius

  • 1Vision Enabling Laboratory, Unit of Optometry and Vision Science, School of Natural Sciences, Linnaeus University, Kalmar, Sweden.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 7, 2010
PubMed
Summary

This study shows that a specific Shack-Hartmann aberrometer provides repeatable measurements of ocular aberrations in the peripheral visual field. The device is effective for assessing off-axis aberrations in young, healthy eyes.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Ocular aberrations impact visual quality.
  • Measuring peripheral aberrations is crucial for understanding visual function.
  • Shack-Hartmann aberrometry is a key technology in ophthalmic diagnostics.

Purpose of the Study:

  • To assess the intrasession repeatability of ocular aberration measurements in the peripheral visual field using a specific Shack-Hartmann aberrometer.
  • To report higher-order off-axis aberrations data in young, healthy emmetropic eyes.

Main Methods:

  • 18 emmetropic participants' right eyes were measured using an open-view Shack-Hartmann aberrometer.
  • Ocular aberrations were assessed at 10° intervals in the horizontal and inferior visual fields.
  • Intrasession repeatability was quantified using coefficient of repeatability, coefficient of variation, and intraclass correlation coefficient.

Main Results:

  • Third- and fourth-order aberrations showed better repeatability than higher orders.
  • Coefficient of variation was <30% and ICC >0.90 for third/fourth-order aberrations.
  • No significant difference in total higher-order root mean square variance between on- and off-axis measurements was found.

Conclusions:

  • The analyzed Shack-Hartmann aberrometer offers fast, repeatable, and valid peripheral aberration measurements.
  • The system is efficient for measuring off-axis aberrations in the peripheral visual field.
  • This technology aids in comprehensive ophthalmic analysis and vision research.