Effects of Gunnar Computer Glasses on Viewing Comfort and Performance

Inclusion Criteria: * Subjects must be between 18 to 42 years old. * Subjects must have a normal color vision (be able to identify the numbers in the color blind test. * Subjects' near and far visual acuity with the better eye needs to be 20/25 or better (measured with a vision chart). Subjects can wear contact lenses (but not glasses) if usually wear them while working on computers. * Subjects must routinely work on a computer or digital display for an average of 4 hours or more each day. * Subjects can communicate in English fluently and are used to read English documents on a computer. * Subjects must have a valid tax number or social security number to receive monetary compensation. Exclusion Criteria: * The difference in the prescription for both eyes is equal to or larger than 2 Diopters. * Subjects have a cataract or have had cataract surgery. * Subjects are sensitive to lights (photosensitivity). * Subjects have prior incidents or are known to have claustrophobia. * Subjects have been diagnosed with oculomotor diseases or central nervous system diseases, or with developmental, neurological, or psychiatric disorders (e.g., attention deficit hyperactivity disorder, autism, mental retardation).