Cataracts result in a slow progressive loss of visual acuity in one or both eyes. Cataracts commonly result in glare and frequent changes in the spectacle prescription required for best vision. Patients may also experience a loss of contrast and occasionally may experience double vision in one eye with cataracts. When cataracts progress and begin to limit the patient's ability to perform the activities of daily life, treatment should be considered. When cataracts interfere with a patient's functioning, common complaints include difficulty with ambulation, reading, excessive glare, night driving, problems recognizing faces, or difficulty performing avocations and or hobbies. Diagnosis. A comprehensive eye examination is the only method of accurately diagnosing cataract. An eye examination with dilation of the pupil will allow the doctor to examine the cataract directly and to rule out the presence of other co-existent eye diseases. The presence of a cataract does not necessarily warrant treatment. A cataract will in no way damage the eye nor will it create strain on the fellow if only one eye is affected. Delaying cataract surgery is unlikely to either make the operation more difficulty or result in a poorer outcome following surgery