Contact lenses can be classified by their material characteristics – soft silicon hydrogel lenses and rigid contact lens (made of flexible plastic).
Lenses are of different varieties by their wear schedule – Daily disposable, monthly and extended wear contact lens.
They could be categorized by their life time — daily disposable, regular monthly disposable etc .
Simply by the visual problem they correct — Spherical, toric or astigmatic, or bifocal.
When it shows up to understanding just what sort of lenses are usually used in contact contacts, the answer contains a very broad range. However, by ‘type’ we generally are likely to mean, what is the stuff that is used make lenses and how these lense can be grouped based on the different forms of material utilized through the entire years.

Inside the earlier days, rigid elements were used in contacts that will failed to support sufficient oxygen permeability to the eyes. This particular caused lots of physical effort and exhaustion to be able to the eyes and so they could not turn out to be worn for long hours at a stretch. However, research in ocular science gave way to newer studies and advanced supplies were developed in making softer contact lens.

one Soft Contacts
Soft contacts have got high oxygen permeability as compared to their precursors. It rests on the iris associated with the eye using the edges resting around the sclera (the whitened part of typically the eye). Contact lens consumers swear by very soft contact lenses while they provide a lot more comfort than rigorous contacts. Now-a-days, very soft contact lens likewise be met with coloured get in touch with lenses that can be used simply for cosmetic functions. You can replace the colour of typically the iris of the eyes to what ever colour you extravagant with soft female contact lenses.

Very soft contact lenses together with prescription come inside different varieties – daily, weekly biweekly, monthly or expanded wear lenses.

a couple of. Rigid Gas Penetrable (RGP)
Rigid petrol permeable disposable lenses are called after the type of substance that goes for making them. The RGP lense are less space-consuming than soft lenses. However , due to their rigidity, hardly any fresh air permeability is achievable. As a consequence, the users require a longer time to conform to these sorts of contacts. Typically the RGP lenses relaxation over the student as well as the edges relaxation within the iris of the eye. Many optometrists believe, although people much more in order to get adjusted to RGP lenses, they may be healthier and even more durable than gentle lens.

3. toric contact lenses is the result of mixing hydrophobic silicone with hydrophilic PHEMA. This material gives an improved comfortableness and has a new high oxygen permeability.

Silicon hydrogel lenses differ from regular hydrogel lenses inside their higher oxygen permeability. However, the hydrogel contact lense possess high water written content (with low hydrogels having12-30% water articles while moderate hydrogels range have 40-70% water; high hydrogels have 90-99. 5% water content while superabsorbent hydrogels have more than 99. 5% water content! )

4. Intraocular Contacts
These lens, made of unbending material known since PMMA or Polymethylmethacrylate and are selected and planted in the eyeball. With time, researchers have researched for making these intraocular lense softer and healthier for your sight. Now-a-days, intraocular lenses are made of soft collapsible materials like silicon or acrylic plus are easily incorporated in the sight.

5. Acrylic Associates
Acrylic contacts are generally expensive though they may not be very popular among the users. This new-age contact lens might have advanced square-edge design, non-glare border design or orange light filtering regarding UV rays to combat vision difficulties.