What are RGP contact lenses?
Rigid gas permeable lenses are small, firm contact lenses that sit on the cornea, the clear front surface of the eye. Unlike soft lenses, which are made from flexible, water-containing materials, RGP lenses are crafted from durable materials that hold their shape while allowing oxygen to pass through to the eye.
You may hear them called gas permeable contact lenses, GP lenses or hard contact lenses. The term "hard lenses" dates back to early contact lenses made from a material that allowed very little oxygen through. Today's gas permeable materials are a significant evolution: still firm, but designed with the health of the eye's surface in mind.
RGP vs. soft contacts: what is the difference?
Both lens types correct vision well for many people. The differences come down to how each lens behaves on the eye.
| RGP lenses | Soft lenses | |
|---|---|---|
| Shape on the eye | Keeps its own shape | Conforms to the eye |
| Vision with corneal astigmatism | Often especially crisp and stable | Good for many with toric designs |
| Initial comfort | Noticeable at first; most wearers adapt | Typically comfortable right away |
| Durability | A single pair can last a long time with proper care | Replaced on a set schedule: daily, biweekly or monthly |
| Customization | Made to precise measurements | Usually chosen from standard parameters |
Neither is universally better. The right choice depends on your prescription, the shape of your cornea, your lifestyle and your experience with contact lenses so far.
Are RGP lenses good for astigmatism?
When astigmatism is caused by an uneven curvature of the cornea, RGP lenses for astigmatism can be an excellent option. Because the lens is firm, a thin layer of tears fills the space between the lens and the cornea, effectively smoothing out the uneven surface. The result, for many wearers, is sharper and more consistent vision than a soft lens can provide.
Not all astigmatism originates in the cornea, and soft toric lenses work very well for many people. A careful evaluation identifies the source and degree of astigmatism and which lens design is most likely to perform well.
What happens at an RGP lens fitting in Lexington?
An RGP lens fitting in Lexington at My Vision Care is a detailed, unhurried process led by Dr. Ron Haddad, OD:
- Consultation. A conversation about your vision, your history with glasses or contacts, and what you would like to improve.
- Measurements. Precise measurements of the shape and curvature of the cornea guide the initial lens design.
- Trial lenses. Diagnostic lenses are placed and evaluated for position, movement and vision.
- Custom lenses. Your lenses are ordered to the final parameters, and you learn insertion, removal and care.
- Follow-up. Return visits confirm vision and comfort, with refinements made where helpful.
