Simple, self-directed vision therapy to build convergence (the ability of both eyes to work together), particularly with patients with bifocals. 
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The basic vision therapy unit for exophoria (overconvergence or being "wall eyed") and useful in cases of premature presbyopia, a diminished ability to focus usually due to age. Keystone View base-out units simulate normal environmental demands on the eye 
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Home vision therapy designed for children 6 to 10 with exophoria (overconvergence, or being "wall eyed"). Convergence builds while the patient is entertained by Cinderella, The Three Bears, Bobby's Christmas and the Three Billy Goats. 
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Vision therapy for reading-related eye fatigue and premature presbyopia, diminished focusing ability usually due to aging. 
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Vision therapy for unusually low fusion (ability of both eyes to work together) , reading-related eye fatigue and premature presbyopia, diminished focusing ability usually due to aging. 
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