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The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
Although glasses and/or patching therapy, exercises, or prisms may reduce or help control the outward-turning eye in some children, surgery is often required. A common form of exotropia is known as "convergence insufficiency" that responds well to orthoptic vision therapy including exercises. This disorder is characterized by an inability of ...
Suppression of an eye is a subconscious adaptation by a person's brain to eliminate the symptoms of disorders of binocular vision such as strabismus, convergence insufficiency and aniseikonia. The brain can eliminate double vision by ignoring all or part of the image of one of the eyes.
Surgery works by changing the shape of the cornea. [5] Far-sightedness primarily affects young children, with rates of 8% at 6 years old and 1% at 15 years old. [ 9 ] It then becomes more common again after the age of 40, known as presbyopia , affecting about half of people. [ 4 ]
There are two ways to record the PFR results, the first being the fusion range (break without recovery) and the other including break and recovery. Follow the examples below for guidance: Fusion range: PFR cc (6m) 8Δ BI → 20Δ BO; PFR sc (1/3m) 16Δ BI → 45Δ BO c diplopia; Break + recovery: PFR sc (6m) -8/6Δ → +20/15Δ c diplopia
Surgery [ edit ] Multifocal intraocular lens implantation is a new possible treatment involving clear lens extraction and multifocal intraocular lens implantation [ 5 ] but it may not be appropriate for patients who have had resistant spasm of accommodation for a long period of time.
Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object. Accommodation is the adjustment of the curvature of the lens to focus on objects near and far. In this condition, amplitude of accommodation of a person is lesser compared to physiological limits for his age. [ 1 ]
Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e., convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e., accommodation). [1]