What it means and why
RGP describes a rigid gas-permeable contact-lens material/design category. A lens retains its shape more than a soft lens while allowing oxygen transmission. The optical system includes the lens and the tear interface, so fitting is more than matching a spectacle power.
RGP is a broad category. A conventional daily-wear corneal lens and a specially designed orthokeratology lens do not have the same purpose or wearing instructions merely because both are rigid and gas permeable.
A worked example
Teaching scenario: a wearer changes from soft lenses to RGP and notices the lens more initially. Sensation alone cannot determine whether the fit is appropriate. The clinician checks position, movement, vision and the ocular surface, and gives a product-specific adaptation plan.
What it does not tell you
Do not use an arbitrary soft-lens care product or overnight schedule for an RGP lens. Compatibility and wearing instructions belong to the prescribed product.
THINK IT THROUGHIs every RGP lens an ortho-k lens?
No. Orthokeratology requires a specific design and fitting; RGP is the broader category.
Sources & reading notes
Page updated:
- FDA · Types of contact lenses ↗ Public health information
Useful for general health explanations and safety guidance; individual assessment and local advice still matter.
- CDC · Cleaning, disinfecting and storing contact lenses ↗ Public health information
Useful for general health explanations and safety guidance; individual assessment and local advice still matter.