Hydrogelläätsed

Hydrogelläätsed, often referred to as hydrogel lenses, are a type of soft contact lens made from a plastic material that contains between 30% and 90% water. This high water content is a key characteristic that makes them comfortable and flexible for wear. The polymer chains within the hydrogel material are cross-linked, forming a network that can absorb and retain large amounts of water. This ability to hold water is crucial for oxygen permeability, allowing oxygen to pass from the atmosphere to the cornea of the eye, which is essential for eye health.

Hydrogel lenses were first developed in the 1950s by Otto Wichterle and Drahoslav Lím, revolutionizing the contact lens industry. They offered a significant improvement in comfort and wearability compared to the rigid gas-permeable lenses that were previously common. The softness and flexibility of hydrogel lenses allow them to conform to the shape of the eye, reducing friction and potential irritation. They are widely used for vision correction, including correcting myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.

The manufacturing process of hydrogel lenses typically involves polymerization of monomers in molds. After polymerization, the lenses are hydrated in a saline solution, which allows them to swell to their final size and shape. Different types of hydrogel materials exist, with varying water content and oxygen transmissibility, allowing for a range of lens designs tailored to different needs and wearing schedules. Daily disposable hydrogel lenses are a popular option, offering convenience and reducing the risk of deposit buildup.