In Dr. Tarrant's eight years of practice, his patients' most common complaint is from those who spend considerable time at a computer. Knowing that most patients' prescriptions do not adequately address mid-distance focus, Dr. Tarrant customized a second prescription based on his knowledge of optics and computer ergonomics.

In 1998, the AOA officially recognized Computer Vision Syndrome (CVS), categorized by the following symptoms: Sore eyes, dry eyes, headaches, neck pain and blurry vision. A study by the AOA in 1998 revealed that US businesses spent approximately $2billion annually on CVS. The latest numbers from the National Institute for Occupational Safety and Health indicate that 80% of those who are on the computer for more than two hours suffer from CVS.

Complaints of computer users became so common in Dr. Larry Tarrant's office that he designed a computer program that configures the lens design needed to alleviate computer-associated eyestrain. The patented program uses factors unique to each individual to design a custom lens. In addition, a light tint can be added, depending on the light source at the computer workstation to help deal with eyestrain.

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