What type of contact lenses typically require a weekly enzyme cleaning regimen?

Gas permeable lenses are typically the type of contact lenses that require a weekly enzyme cleaning regimen. This is because these lenses are made from rigid materials that allow oxygen to flow through while also retaining deposits from tear film and environmental factors. Enzyme cleaners effectively break down and remove protein buildup, helping to maintain the clarity and comfort of the lenses.

In contrast, soft contact lenses are generally cleaned daily with multipurpose solutions, while daily disposables do not require any cleaning regimen as they are discarded after one use. Toric lenses, designed for astigmatism correction, can be either soft or gas permeable; however, if they are soft lenses, they would follow the same cleaning protocol as other soft lenses. Therefore, the unique cleaning requirement for gas permeable lenses highlights their maintenance needs for optimal performance and hygiene.