Autorefractors: A Device For Eye Test


Autorefractors certainly are a helpful tool when determining the degree of refractive mistake in the eye. Gone are the times when optometrists depended only on the patient's insight to learn the prescription needed. Having auto refractors and keratometers, precise measurements are created based on light entering the eye.

What's an autorefractor?

Autorefractors measure how light is affected by reflecting through the eyeball, specifically a cone of infrared light. Quick and painless for the patient, they provide a fantastic baseline to find the right eyeglass or contact lens prescription. They give an objective reading ahead of the subjective tests that follow on a phoropter.

How can an autorefractor work?

An autorefractor functions by glowing light into the eye and testing how it bounces down the rear of the eye. The individual is revealed a graphic that actions in and out of focus, using many dimensions of the reflections to find out when the eye is properly focused. When these figures are come up with, it's clear what amount of vision correction is required for the patient to see at their best.

What're the most important features to take into account when looking at an autorefractor?

The main features to consider when selecting an autorefractor are based entirely on your preferences and needs. The following questions might help narrow down your alternatives:

  • Can it be automated or manual?
  • Does it perform keratometry?
  • How accurate is the machine?
  • How can the refractive data integrate with my current EMR system?
  • What's the rate of the measurement, and how well does it improve individual accommodation?
  • Will that let me a more detailed exam?

Utilize the following chart to compare autorefractors/keratometers accurately. Doubling as a keratometer, these machines will also measure the design of the cornea.

A study suggests that autorefractors may be inclined to overdiagnose myopia in school-age children when measuring under non-cycloplegic conditions.

Yee-Fong Choong, FRCOphth, and colleagues in Kuala Lumpur conducted the cross-sectional, community-based study. The researchers obtained autorefraction from 117 children using three autorefractors and compared them with subjective refractions obtained with and without cycloplegia.

The researchers found that two autorefractors produced significantly different non-cycloplegic mean spherical equivalents set alongside the monocular subjective refraction. Without cycloplegia, the Retinomax K plus 2 measured a mean SE of -1.55 D (P < .0001), and the Canon RF10 measured a mean SE of -1.11 D (P = .0023), while the mean monocular subjective refraction was -0.8 D.