RGP Fits Flashcards
Describe fit
3-point touch with ideal edge lift
Describe fit
Steep central fitting (central pooling) with tight edge lift
Describe fit
Flat central fitting and increased width of fluorescein ring (arrow), indicating loose edge lift
Describe fit
Minimal edge clearance
Describe fit
Excessive edge clearance
Describe fit
Centred lens
Describe fit
Fluorescein stain highlighting corneal impression ring and diffuse epithelial staining secondary to an adhered RGP (which has been removed in a keratoconus patient.)
Describe fit
3 point touch
Describe fit
Apical bearing and subsequent swirl staining
Describe fit
Inferior edge lift with dimple veiling
Describe fit
Apical clearance ‑Central fluorescein pooling and thin edge
clearance is visible. The fit should be modified using a flatter base curve
Describe fit
Apical bearing ‑Central bearing, seen as dark area because
of lack of fluorescein in this area with thin edge clearance at 3 O’ Clock
position, this can result in staining in the same area
Describe fit
: Diffuse fluorescein in the centre and midperiphery on either
side depicting the three point touch
Describe fit (from rose k guide)
3 pt touch with optimal edge lift giving a fluorescein band of 0.5-0.7mm with no peripheral seal at any point
Describe fit (from rose k guide)
Excess edge lift, standard steep edge lift recommended
Describe fit
Apical clearance
Describe fit
Apical bearing
3 point touch
Excessive apical bearing
Excessive apical clearance
3 point touch
A spherical ROSE K2 lens fitted on an asymmetric keratoconic cornea that fits well at 3, 9, and 12 o’clock but causes edge to lift off at 6 o’clock
Good fit at all edges including 6 o’clock now that we have incorporated ACT into the design (inf quadrant steepened)
12 and 9 o’clock clearance in dumbell shape pattern with poor edge clearance 3 and 6 o’clock due to WTR astigmatism (can be improved with a peripheral toric design for the Rose K)
