Lens Crafter

Hydrogel contact lenses are composed of crosslinked polymer networks that absorb and retain water, allowing for flexibility and comfort.

These materials contain hydrophilic functional groups such as hydroxyl (-OH), carboxyl (-COOH), and amide (-CONH₂) groups, which enable the lens to bind water molecules through hydrogen bonding.

The water content in hydrogel lenses typically ranges from 30% to 80%, affecting oxygen permeability—higher water content generally increases oxygen diffusion.

Silicone hydrogel lenses incorporate siloxane (-Si-O-) bonds, which enhance oxygen permeability independently of water content, making them more breathable while maintaining hydration.

The balance of water retention and oxygen transmission is critical for eye health and lens performance.