What does the water content of a contact lens mean? | 合法醫療器材資訊網

2020年12月8日—Mostcontactlensestodayaremadefromasoftplasticknownashydrogels.Hydrogelsabsorbalargeramountofwatertokeepthelenssoft.The ...

Medically reviewed by Sharon Copeland[1] on 8 December 2020

The water content of a contact lens means precisely that – how much of the contact lens is made up of water. This figure is always given as a percentage.

The higher the water content in a contact lens, the more oxygen reaches the cornea during lens wear. This is important for healthy eyes.

The relationship between water content and oxygen transmission is not the same with lenses made with silicone hydrogel materials. These contact lenses achieve very high levels of oxygen regardless of their water content.

Most contact lenses today are made from a soft plastic known as hydrogels. Hydrogels absorb a larger amount of water to keep the lens soft. The absorbing power of hydrogel material is also known as water content.