What contacts are made from methafilcon A?
Hubble Contacts are made of methafilcon A, a soft contact lens material that was FDA approved in 1986 and hasn’t changed since.
What is methafilcon A?
The lens material, methafilcon A, is a random copolymer of hydroxyethylmethacrylate and methacrylic acid. The lenses are made by modifying the uncolored methafilcon A lens by affixing a colored pigment on that portion of the front surface that corresponds to the iris.
Which contact lens material is best?
Silicone-based materials create an extremely breathable lens that lets plenty of oxygen pass through to your cornea. They also keep deposits from building up. That means less irritation from dry eyes. Some silicone contacts are FDA-approved for extended wear, so you can use them for up to 30 days.
What is Nelfilcon A?
Another lens material described as biocompatible is nelfilcon A (Alcon), a polymer of polyvinyl alcohol partially acetalized with N-formylmethyl acrylamide and with a 69% water content.
What is the difference between hydrogel and silicone hydrogel?
Silicone hydrogel lenses are a more porous type of soft contact lens than regular hydrogel lenses, allowing more oxygen to enter the cornea. It’s a hybrid of hydrogel and silicone that boosts the oxygen permeability of the lenses. This feature makes them an excellent choice for long-term use.
What type of lens do most eye doctors recommend monthly?
Silicone hydrogel is an advanced material that allows up to five times more oxygen to reach the cornea, keeping the eyes healthy and comfy for longer. This makes silicone hydrogel an excellent fit for longer wear lenses, like monthlies or bi-weeklies.
How do I choose the right power for contacts?
If a GP lens is selected with a base curve radius that’s one-half diopter flatter (less curved) than the cornea, a contact lens power of -2.75D would be predicted. If the base curve radius is a half diopter steeper (more curved) than the cornea, a contact lens power of -3.75D would be predicted.
What is Omafilcon A?
PROCLEAR (omafilcon A) multifocal and multifocal XR lenses are indicated for the correction of refractive ametropia (myopia and hyperopia) and emmetropia with presbyopia in aphakic and non- aphakic persons with non-diseased eyes.