Tvrda gas-propusna (RGP) kontaktna sočiva Koncepcija

Slide 18
Dizajn zadnje površine:
Cliničko razmatranje
• Centralni model fluoresceinom
• Promene u krivini kornee
• Viđenje
Rigid Gas Permeable Contact Lenses Design
Back Surface Design: Clinical Considerations
Central fluorescein pattern.
The use of sodium fluorescein is a sensitive technique for comparing the cornea’s shape
to that of a trial contact lens by highlighting the differences between them.
Corneal curvature changes.
When a fitting relationship other than alignment is chosen, the possibility that the lens
may alter the corneal curvature and/or shape needs to be considered.
Lens adherence.
Virtually all EW RGP wearers will show an episode of lens adherence at some time and it
is still not clear what, if anything, can be done to eliminate the occurrence.
Vision.
If the corneal shape is normal and regular, the tear lens power, and its influence on the
final BVP required, is directly influenced by the BOZR chosen. If the cornea is irregular,
keratoconic or highly astigmatic, the overall back surface shape, as well as the BOZR,
may influence the vision outcome.
Dizajn zadnje površine:
Cliničko razmatranje
Centralni model fluoresceinom.
Korišćenje natrijumovog fluoresceina je osetljiva tehnika za poređenje oblika kornee sa
oblikom probnog sočiva tako što su oblasti gde postoje razlike svetlije.
Promene u krivini kornee
Kada se izabere neki drugi način fitovanja od potpuno podešenog, postoji mogućnost ta
sočivo menja krivinu kornee.