CONTACT LENSES WITH PRISM
WHAT ARE CONTACT LENSES WITH PRISM?
Some patients have difficulty seeing and need a prism in their glasses. These patients may have double vision or difficulty using both eyes to work together. The prism moves an image so it can help vision when eyes are not aligned.
Prism can be used in contact lenses as well, but there are limitations. With soft contact lenses, only a certain amount of prism may be put in the lenses. With scleral lenses, many kinds and amounts of prism may be added but the lenses must be perfectly fit to work properly.
The best way to see if contact lenses with prism are an option for you is to have a consultation. We will measure the eyes and determine if you would benefit from this type of technology, and what type of lens we would need to use.
HOW DO THESE LENSES WORK?
Prism is used to bend light (a.k.a. an "image") to where your eye is.
Our brains use two images (right eye and left eye) and fuse them into one image. This gives us depth perception.
When this fails, a person will see double.
A prism is used in glasses (or contact lenses) to take an image and move it so that the brain can fuse the two images.
There are two types of double vision: horizontal and vertical.
Vertical double vision is when the two images are above and below the other.
Horizontal double vision is when the two images are side by side.
This doubling will go away when you close one eye. If the double vision remains with one eye closed, there may be more issues at play and a comprehensive eye exam is recommended first.
Vertical double vision can be corrected with soft contact lenses or hard contact lenses.
Horizontal double vision can ONLY be corrected with one lens: the EyePrintPRO scleral lens. This is the only lens in the world that can fully correct this type of double vision.
Both of these can work extremely well! Our consultations include a thorough assessment of all ocular issues and a discussion about options to see your best!
These photos are from a patient of ours who had horizontal double vision. We took impressions of the ocular surface in order to create an extremely stable EyePrintPRO scleral lens. This lens incorporated 2.5 Diopters of prism in each eye. This got rid of her double vision. We also added multifocal optics to the lens so the patient was able to see in the distance and to read without any glasses.
One of our patients had vertical double vision after damage to his eye socket during the Oklahoma City Bombing in 1995. He had permanent double vision, more noticeable while he was looking down at a golf ball.
We fit this patient with a soft contact lens with prism. This prism corrected his double vision so he could play golf again.
Another patient of ours is a professional athlete who lives in a different country. He was evaluated by a specialist in his country and the United States who spoke with us to design a contact lens for double vision.
He had significant vertical double vision that worsened with exercise. We shipped him lenses with multiple different prisms to try. He ended up functioning and playing much better with the strongest prismatic soft contact lens.
He continues to see his local Doctor to maintain his ocular health with the lens.
This patient presented to us on a referral from a prominent physician in the area. They had longstanding double vision and wore monovision soft contact lenses (one eye for distance, one eye for near).
After evaluating her, her double vision was able to be eliminated with 3.0 Diopters of prism in one eye. However, we thought that the doubling she experienced was potentially a result of her monovision, and not her true eye turn, since her double vision wasn't prevalent all the time when out of her contact lenses.
We trialed her with soft contact lenses in both eyes to correct her distance prescription. So far she is doing well with no double vision with these lenses.
If her double vision manifests again, we will fit her with custom soft contact lenses with vertical prism correction.