These lenses are made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are may be more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your eye while you wear your lenses.
RGPs are durable and resistant to deposit buildup. They tend to be less expensive over the life of the lens since they last longer than soft contact lenses. They are easier to handle and less likely to tear. It may take a few weeks to get used to wearing RGPs, compared to several days for soft contacts.
Extended-wear contacts are available for overnight or continuous wear ranging from one to six nights or up to 30 days. They are made of flexible plastics that allow oxygen to pass through to the cornea. There are also a very few rigid gas permeable lenses that are designed and approved for overnight wear. Length of continuous wear depends on lens type and your tolerance for overnight wear. It’s important for your eyes to have a rest without lenses for at least one night following each scheduled removal.
Disposable contacts offer both comfort and convenience for most contact lens wearers. Disposable contacts are usually available as follows:
The lenses are designed to provide good vision to people who have a condition called presbyopia. A sign that you are developing presbyopia is that you need to hold menus and other reading materials further from your eyes to see it clearly. These types of contact lenses are available in soft disposable or rigid gas permeable designs.
Toric lenses are designed for people with astigmatism. They have two powers in them, created with curvatures at different angles (one for astigmatism, the other for either myopia (near sightedness) or hyperopia (far sightedness). There’s also a mechanism to keep the contact lens relatively stable on the eye when you blink or look around.
Properly fitting a toric lens takes time and requires more expertise than regular contacts. Consequently you can expect that a fitting for torics will be more expensive than a regular contact lens fitting. The lenses themselves also cost more than spherical lenses.