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Doctors use prism to correct for either vertical or horizontal misalignments in a person’s eye position.
The normal result of this is that the patient starts with double vision (Diplopia), the doctor then
induces prism into the prescription, and hopefully after the end result is done, the person
sees one image again. |
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Doctors test for the need for vertical and horizontal prism using a Worth Four Dot Flashlight
with a special pair of eyeglasses with one lens red and one lens green. |
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Most people who are making eyeglasses are always following the instructions of the worksheet
that is in front of them. Lab techs are not licensed opticians in most cases. When a person enters
measurements for a client with prisms, it is more common than not that after the lenses are cut,
they are in the wrong spot consistently over and over again, which is Einstein’s Theory of Insanity. |
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What actually happens is that all these high tech layout machines for cutting eyeglass lenses
are done on photography. When you put an eyeglass lens into this unit, the prism displaces the
fitting cross on the other side of the eyeglass lens. What really has to happen here is that they
eyeglass lenses have to be placed onto the tracer into a compensated place to end up with
the lenses aligning properly. |
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Also very common is that people with large astigmatisms with oblique axes, generally will get
their lenses back from the laboratory twisted due to the same kind of phenomenon that happens.
We recognize these problems at the Vision Fore Golfing laboratory and we will compensate
for this so that your eyeglasses do turn out accurate. |
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While correcting for vertical or horizontal misalignments is a challenge when manufacturing
eyeglasses, golfers who may have stopped playing because of double vision can now
get back on the course with our custom made Vision Fore Golfing Eyeglasses. |
DIPLOPIA commonly known as double vision, is the perception
of two images from a single object. The images may be horizontal, vertical, or diagonal.
When a object (A) is closer to the person than the fixation point (F).
The images of (A) fall on non-corresponding points of the two retinas.
The images are then projected on to different points and vision become blurred. |
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BINOCULAR DIPLOPIA
Double vision can occur when the two eyes are not correctly aligned while aiming
at an object, such as in esotropia and exotropia - these result in uncrossed
diplopia and crossed diplopia, respectively (i.e. "crossed eyes",
in esotropia, result in uncrossed diplopia). When the eyes are misaligned and
aimed at different targets, two non-matching images are sent to the viewer's brain.
When the viewer's brain accepts and uses two non-matching images
simultaneously, double vision results. |
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Double vision is dangerous to survival, therefore, the brain naturally guards against its occurrence.
In an attempt to avoid double vision, the brain can ignore one eye (suppression). Due to the brain's
ability to suppress one eye, double vision can appear to go away without medical evaluation or treatment.
The causes of the double vision are very likely still present and loss of vision in one eye can occur
due to lack of treatment. The loss of vision in one eye can be temporary or permanent depending
on detection and treatment. It is in this way, that diplopia contributes to loss of depth perception
and binocular vision, amblyopia (lazy eye), and/or strabismus (deviating eye). |
MONOCULAR DIPLOPIA
Diplopia can also occur when viewing with only one eye; this is called monocular diplopia,
or where the patient perceives more than two images, monocular polyopia. In this case,
the multiple vision can be caused by a structural defect in the vision system, such as cataracts,
subluxation of the crystalline lens or Keratoconus causing irregularities in the refraction of
light within the eye. |
TEMPORARY DIPLOPIA
Temporary diplopia can also be caused by intoxication from alcohol or head injuries, such as concussion.
If temporary double vision does not resolve quickly, one should see an eye doctor immediately.
It can also be a side effect of the anti-epileptic drugs Phenytoin and Zonisamide. |
Treatment for binocular diplopia
Treatment for binocular diplopia includes prism lenses and/or vision therapy. Daily wear of prism
lenses is the passive compensatory treatment. Vision therapy is an active treatment which retrains
the visual and vestibular systems (brain, eye muscles, and body). Vision therapy may eliminate the
need for daily wear of prism lenses. |
