Standard DEFINITY progressive lenses were the first progressive lenses to split a wearer’s required ADD power between the front and the back of the lens. By splitting the ADD power, the amount of unwanted distortion is distributed across
2 surfaces. Traditional progressive lens designs only use one surface for a prescription, meaning unwanted distortion can only be distributed across one surface. By distributing distortion across both surfaces, DEFINITY maximizes the amount of clear viewing space in the lens.

Standard DEFINITY progressive lenses outperform the competition, especially at stronger prescriptions. However, they do not provide the level of customization of DEFINITY® 3 or DEFINITY® 3PLUS.