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Shedding Light on Retinoscopy

Sometimes, particularly when performing an eye exam on small children the optometrist will direct a beam of light in the eye. But what does this do? Firstly, this test is known as a retinoscopy examination, and it's a basic way to determine the refractive error of your eye. Whether you're near or farsighted, or you have astigmatism, examining the reflection of light off your retina is one way your eye doctor can determine whether you need eyeglasses.

The main thing your doctor is looking for during this exam is how well your eyes can focus on the light. When we use the retinoscope to shine light into your eye, a reddish light reflects off your retina, through your pupil. Eye doctors call this the red reflex. We use the light to determine your focal length, or in simpler words, to measure the precise angle at which light refracts off your retina which lets us know how well your eye focuses. If it's apparent that you can't focus properly, we hold up a variety of prescription lenses in front of your eye to determine which one fixes the refractive error. This is exactly how we find out what prescription your glasses or contact lenses need to be.

The retinoscopy exam is performed in a dark or dimmed room. The patient will usually be told to focus on something behind the doctor. This makes eyes easier to examine. Unlike eye examinations you may have had, your doctor won't ask you to read any charts. This means that a retinoscopy exam is also a really useful tool to determine the prescriptions of the speech-impaired, or young children.


We will be open for routine eye exams on Monday, May 18. Click here to read or COVID-19 Safety protocols.

Dr. Schechter is also seeing patients via Telemedicine as well.

Please call us at 215-745-0993 with any questions or concerns and we will get back to you as soon as possible

In addition, we can still take orders for contact lenses and ship them directly to your house. Plus we will WAIVE SHIPPING COSTS! Just give us a call and we’ll order your lenses for you right away.