Statistics indicate 125 million people around the world, and as many as thirty-eight million in the United States, wear contacts. Designer contact lenses are offered in the market to address different needs. Although a smaller percentage wear rigid gas permeable lenses, soft contact lens wearers apply to almost ninety percent of those in the U. S. Lenses to correct for vision conditions such as nearsightedness or farsightedness a a spherical lens design is common.