Stereo Acuity and Summation: The Advantage of Two Eyes

minions

 

Frequently during eye exams, patients will notice they see better on the eye chart with two eyes open, and will try to sneak around the cover paddle to get to two eyes ASAP. We are well familiar with the mathematical rule, the whole is not greater than the sum of its parts, but eyes are an exception to this rule. Summation describes the brain’s ability to add the vision from each eye in order to produce better visual acuity than one eye provides alone. As a result, the exam chart may read something like this:

20/20 Right(OD), 20/20 Left(OS), 20/15 Both(OU)

Stereo acuity, or 3-D vision, is another binocular (when two eyes work together) visionprocess. Because the eyes are physically separated by space, they view object from a different angle, and the brain can then interpret depth. For example, those of you without stereo cannot appreciate 3-D puzzles and movies.

Eye conditions that can limit summation and stereo acuity include refractive error, amblyopia, monovision, esotropia, exotropia and a host of possible medical eye concerns.

We advise all minions, one and two-eyed, to have regular eye exams.

From the eye doctors, opticians and staff at Rinkov Eyecare Centers. We’ve provided comprehensive eye exams, contact lenses, eyeglasses, sunglasses and medical treatment of eye disease such as cataract treatment in Columbus, Ohio, for over 35 years. Come see an optometrist at one of our Columbus locations – Downtown, West, East, Westerville, Dublin, Bexley, Worthington and Nationwide Plaza.

Depth Perception – Explained by an Optometrist

Depth PerceptionWhile depth perception can be obtained by context cues such as size difference between near and distant objects, true depth perception, or stereopsis, is obtained by viewing an object with both eyes simultaneously from slightly different viewing angles. This difference in viewing angles between the two eyes is known as parallax. The greater the difference in parallax between the two eyes, the greater the depth perception. Therefore, someone with wide-set eyes has slightly better depth perception than someone with close-set eyes. Further, people who only have one eye (or one eye that turns properly) are not able to focus two eyes at the same object at the same time. These people will typically have very poor depth perception.

Want to learn more about depth perception or think your eyes may not be working well together? Contact our offices for a 20-Point Eye Exam™ and all your questions will be answered!

From the eye doctors, opticians and staff at Rinkov Eyecare Centers. We’ve provided comprehensive eye exams, contact lenses, eyeglasses, sunglasses, and medical treatment of eye disease such as cataract treatment in Columbus, Ohio for over 35 years. Come see an optometrist at one of our Columbus Ohio locations – Downtown, West Columbus, Dublin, Westerville and Reynoldsburg.

CARE : 20|20 : LIFE

*this advice is general in nature and does not constitute an exam. For specific advice, see your eye doctor or healthcare professional.*

Image Source: Mission3-D Blog