H

Hard contact lenses

The first hard contact lenses were made of glass. In 1936 there was the discovery of PMMA – polymethylmethacrylate, which replaced the glass. It is a material…

HPMC (Hydroxypropyl methylcelulosa)

HPMC (Hydroxypropyl methylcelulosa) is a moisturising component included in the contact lens blister solution in which contact lenses are stored. This means it starts working straight after you…

Hyaluronic acid (sodium hyaluronate)

Hyaluronic acid is a natural part of the human body. It has amazing water binding qualities, ideal for dry eye syndrome treatment. Combining eye drops with hyaluronic acid is one of the most…

Hydrogel

This is the material soft contact lenses are made of.

Hypoxia and hypercapnia

Under natural circumstances, the cornea accepts oxygen from the environment and excretes its metabolic product, carbon dioxide, into the environment. An applied contact lens represents a…