7/12/2023 0 Comments Prism glasses![]() Testing for convergence ability involves measuring the distance from the eyes that the patient can hold the eyes together without double vision (near point of convergence) and the amount of prism that can be placed in front of the eyes before double vision is seen (fusional vergence amplitude). ![]() HOW SHOULD A PATIENT BE TESTED FOR CONVERGENCE INSUFFICIENCY?Ĭonvergence insufficiency is diagnosed by an ophthalmologist, optometrist or orthoptist after getting a history of the patient’s symptoms and measuring convergence ability. Symptoms can vary with convergence insufficiency and not all symptoms are present in every patient. Patients may squint or close one eye when reading. ![]() Many patients will complain that they have a hard time concentrating on near work (computer, reading, etc.) and that the written words will move around and become blurry after reading for a long time. Symptoms of convergence insufficiency include diplopia (double vision), headaches and eye strain while reading. WHAT ARE THE SYMPTOMS OF CONVERGENCE INSUFFICIENCY? The eyes are straight for focusing on things far away. However, in convergence insufficiency the eye drifts outward on its own and causes problems only when focusing on near objects. Sometimes, a well-controlled intermittent exotropia (outward eye turning) will be present when focusing at near and distance in a patient with convergence weakness. In convergence insufficiency, eye drifting out occurs only when focusing at near. WHAT IS THE DIFFERENCE BETWEEN CONVERGENCE INSUFFICIENCY AND EXOTROPIA? Typically, one eye will turn outward (intermittent exotropia ) when focusing on a word or object at near in those with convergence insufficiency. von Noorden Young Investigator AwardĬonvergence insufficiency is when it is not possible to keep the two eyes working together (also called binocular function) while working close up. Eunice Kennedy Shriver National Institute of Child Health and Human Development.Centers for Disease Control and Prevention.For some patients, prism lenses may eliminate the need for surgery to correct crossed or double vision. Prism lenses are able to provide long-term correction of double vision and related conditions so that patients can go on to wear regular glasses or contacts. These lenses may not be needed permanently. When combined with eye exercises to further manipulate muscles, many patients achieve successful correction with prism lenses. Prism treatment often makes the difference between satisfactory and highly successful vision correction. Prism lenses look the same as regular lenses and can be used in bifocal, trifocal or variable focus lenses so that patients can achieve full vision at all distances. Treatment with prism lenses can be used in glasses or contact lenses to provide advanced vision correction for patients suffering from a muscle imbalance. In addition to poor eyesight, these conditions can cause some of the following symptoms: Depending on each patient's individual needs, prism lenses can display the image in any direction to either adjust one eye or coordinate both eyes to work together. Prism lenses bend light and align eyes so that they work together to produce a single image, rather than the double vision experienced by many patients with these conditions. Vision problems after a traumatic brain injury.Some cases of muscle imbalance may worsen over time, which is why it is important to seek proper treatment. Eyes that do not work properly together can cause blurred, crossed or double vision. Muscle imbalances within the eyes often occur as a result of genetic factors, trauma or related conditions, and result in one eye that is stronger than the other.
0 Comments
Leave a Reply. |