Been 10 years on, since the first launching of silicone hydrogel contact lenses. E.g. of silicone hydrogel lenses are O2 Optix, Air Optix, Focus Night & Day, Pure Vision, Acuvue Oasys, Biofinity and Clariti. Silicone hydrogel lenses will give sufficient oxygen transmissibility to meet the corneal oxygen needs during wear. Thus, benefiting those who wear contact lenses for long hours and higher prescription patient. Silicone hydrogel provides significant improvement in oxygen performance, being 5 to 10 times higher than that of hydrogel materials

Wearers may notice that the water content (indicated on the box of purchase) for silicone hydrogel lenses is much lower compare to hydrogel lenses. E.g. O2 Optix (Ciba Vision) water content 33%, while Soflens 59 (B&L) water content 59%.  For silicone hydrogel material, the lower the water content of the lenses, the higher the oxygen permeability. However, different manufacturers will use different techniques to make the surface of the silicone hydrogel lenses hydrophilic and wettable to ensure wearers comfort in using. Care regimen (multipurpose solution) also affects the wettability of silicone hydrogel material. Preferably, use care regimen that is recommended on silicone hydrogel lenses.

From wearers feedbacks, silicone hydrogel lenses have shown to offer wearers high level of comfort (although the material is slightly stiffer than traditional hydrogel lenses) and reduce dryness for many wearers even in dry and challenging environment. Silicone hydrogel material has lower level on eye dehydration compared with traditional hydrogel material.

Lens deposition. Silicone hydrogel material will attract relatively low level of lysosyme (protein) and lipid (oils) from the eye during wear. Thus, it is recommended to rub the contact lenses front and back surface after wear before storing.  Or recommended to use care regimen that incorporates with surfactant. Otherwise, these will cause discomfort and blurred vision after certain period time of wearing.

Leave a Reply

Your email address will not be published. Required fields are marked *