High myopia: large-diameter lenticular RGP
A larger rigid lens sits steadily under the eyelid, for crisp vision with fewer halos at night.
- 01Keratoconus: five custom lens options
- 02High myopia: large-diameter lenticular RGP
- 03High astigmatism: rigid lenses only
- 04High hyperopia: why custom soft comes first
- 05Presbyopia: multifocals measured, not guessed
- 06Prosthetic lenses: appearance, comfort and vision
- 07Severe dry eye: scleral lenses for surface repair
Why a large lenticular RGP
Part 02 · 01For patientsA larger rigid lens sits steadily under the eyelid, giving crisp vision with fewer halos at night.
Lenticular design
Almost every high-minus RGP is lenticular, which thins the edge.
Oxygen
Lenticular design, a high-Dk material and the tear pump keep hypoxia low.
Optic zone
A controlled optic zone diameter keeps the pupil covered.
Stability
Lid attachment steadies the lens: less blink movement, and less night halo and glare.
Keeping the pupil covered
Part 02 · 02A large, well-centred lens keeps its optic zone over the pupil, even when the pupil widens at night.
Illustrative only: about a 10.8 mm lens, 8 mm optic zone and 6 mm night pupil.
Why this differs from high hyperopia
Part 02 · 03High myopia and high astigmatism gain both optics and stability from a rigid lens. High plus RGPs have to stay small and tend to drop, so high hyperopia usually starts with custom soft instead.
High hyperopia →Key takeaways
Part 02- 01High myopia: large-diameter lenticular RGP
- 02Lenticular edge, high-Dk material and tear pump keep oxygen up
- 03A covered pupil and lid attachment mean fewer night halos
Book a contact lens assessment.
Optometrists and ophthalmologists can refer through our referral form.
General health information only, not personal advice. Everyone’s eyes are different. An optometrist or doctor should examine you before any treatment is decided.