The Commission charged that Transitions Optical, Inc., the nation’s leading manufacturer of photochromic treatments that darken corrective lenses used in eyeglasses, used anticompetitive practices to maintain its monopoly and increase prices. Photochromic treatments are applied to eyeglass lenses and treated lenses darken when exposed to UV light. The FTC charges that the company illegally maintained its monopoly by engaging in exclusive dealing at nearly every level of the photochromic lens distribution chain. The FTC alleged that Transitions’ exclusionary tactics locked out rivals from approximately 85 percent of the lens caster market, and partially or completely locked out rivals from up to 40 percent or more of the retailer and wholesale lab market. Under FTC consent order, Transitions agreed to stop all exclusive dealing practices that pose a threat to competition, making it easier for competitors to enter.