Contex , Incorporated is a specialty custom contact lens company, dedicated to perfecting lenses and vision for patients throughout the world. Contex is best known for its invention of the reverse geometry OK Lens, the first contact lens designed for orthokeratology. The Contex name is one of the best-known and most respected contact lens brands in the world. Contex is celebrating its 43rd anniversary. What Products do we offer? Contex offers all types of gas permeable contact lenses from simple "Single Vision" to the most complex "non-symmetric" toric lenses. We also offer carefully selected lens care products.