Soft contact lenses are very widespread but there is one more category of lenses with which people are not very familiar. They are gas permeable (GP) contact lenses which are also referred to as rigid gas permeable, or oxygen permeable lenses.
Rigid gas permeable lenses are hard; but they shouldn’t be misunderstood with old-type “hard” contact lenses, which are now outdated. Hard contact lenses were manufactured from a substance described as PMMA. The trouble with PMMA lenses is that they are hard to adjust and rather uneasy to wear. Also, PMMA does not permit oxygen to move through it, and for the eyes to remain healthy a lot of oxygen is required.
- Rigid gas permeable lenses were first available to the general public in the late 1970s and in reality make use of a more advanced technology in comparison to soft lenses.
- The majority of rigid gas permeable lenses make use of silicon, making them more flexible than PMMA in the process.
- Silicon is oxygen permeable, hence oxygen can move through GP lenses.
- This leads to enhanced comfort and ensures the health of the eye in a better manner.
- In truth, rigid gas permeable lenses enable greater amounts of oxygen to reach the eye in contrast to conventional soft contact lenses.
- However, certain contemporary silicon hydrogel soft lenses are similar to rigid gas permeable lenses in oxygen transmission.
Rigid gas permeable lenses can also offer better vision, sturdiness, and resistance to deposit than soft contact lenses. They can be cleaned without much difficulty. Because they’re durable, they can be less costly in the long run than soft lenses.
However, rigid gas permeable lenses are not widely used in comparison to soft lenses since soft lenses provide instant comfort when worn, and rigid gas permeable lenses need an adjustment period before they can provide comfort.
Rigid gas permeable lenses make available certain exceptional advantages than soft lenses. Since rigid gas permeable lenses are made of a tough substance, they hold on to their shape well even when an individual blinks. This has a tendency to offer sharp vision than a soft lens would.
Rigid gas permeable lenses are exceedingly long-lasting. Even though they can be broken when a person steps on them one can’t tear them easily as soft lenses. They are manufactured from materials that don’t have water while soft contact lenses do. Hence protein and lipid from an individual’s tears do not stick to rigid gas permeable lenses as easily as they do to soft lenses. GPs are generally recommended for individuals who don’t acquire satisfactory vision with soft lenses. Certain individuals with astigmatism for whom soft contact lenses do not yield the desired result also find rigid gas permeable lenses extremely useful.