HomeArticlesPrism in Glasses: What Is It & How Does It Impact Vision?
Prism in Glasses: What Is It & How Does It Impact Vision?
October 13, 2019
Prism correction is an optical element added
to your glasses to reduce or eliminate double vision, also known as diplopia. When experiencing double vision with both
eyes open, the images entering your eyes are falling in two different places on your retinas. Unfortunately, this causes double vision. Prism in glasses helps re-align the images
at the same point in the back of both eyes. Doing so allows you to fuse both images together
to create one, single image. Fortunately for you, your optometrist or ophthalmologist
can prescribe you prism to aid in managing your double vision. Depending on your need, prism is measured
and prescribed in diopters, ranging anywhere from 0.5 diopters up all the way up to the
extreme 40 diopters! Prism base can be set up, down, in or out,
and works to shifts the image location to trick your brain into thinking the images
are in the same place, thus creating one clear image. Also, prism can be placed all in one lens
or split between two lenses. Both achieve the same result and allow your
eyes to work together in unison. Double vision can be caused by a muscle imbalance
in your extraocular muscles, such as an eye turn (i.e strabismus) or a disproportion in
the prescription required in each eye. Other causes of double vision that can benefit
from prism include a stroke or concussion-related brain injury. Lastly, your eye doctor may suggest a trial
with fresnel prism before prescribing it for your glasses. Fresnel prism is a press on vinyl sticker
that easily adheres to an existing pair of glasses, and can be removed without damage
to your current glasses. Fresnel prism often gives instant relief of
double vision and is an opportunity to try the benefits of prism without risk or major
cost. Think you could benefit from prism in your
glasses? Visit your local eye care professional today!