Extendedwear

Extended wear refers to the practice of wearing contact lenses for longer periods than typically recommended, often overnight. This can include daily wear lenses worn for multiple days or overnight wear lenses specifically designed for such use. The primary benefit of extended wear is convenience, eliminating the need for daily lens removal, cleaning, and insertion. However, this practice carries significant risks.

The cornea, the transparent front part of the eye, relies on oxygen from the air. When contact lenses are worn, especially for extended periods or overnight, oxygen supply to the cornea is reduced. This can lead to hypoxia, a condition where the cornea is deprived of oxygen. Prolonged oxygen deprivation can cause various complications, including corneal neovascularization (the growth of new blood vessels into the cornea), corneal ulcers, and microbial keratitis, a serious infection that can lead to vision loss.

Several factors influence the safety of extended wear, including the type of lens material, the individual's ocular health, and adherence to proper lens care and hygiene practices. Lenses made from silicone hydrogel materials generally allow for more oxygen permeability compared to traditional hydrogel lenses. However, even with advanced materials, extended wear significantly increases the risk of eye infections and other sight-threatening conditions compared to daily wear.

Ophthalmologists and optometrists strongly advise against extended wear due to the elevated risk of complications. They recommend following prescribed wear schedules and consulting with an eye care professional before considering any deviation from standard contact lens usage. Regular eye examinations are crucial for contact lens wearers, especially those engaging in or considering extended wear, to monitor for any signs of complications.