Description
The BioFlex SA is a rigid gas permeable contact lens with sphero-aspheric geometry, easy to fit for spherical or low toricity corneas.
Adaptation
Start with :
Choice of lens diameter (ØT)
The diameter of the first trial lens is limited to that offered in the trial box (9.60), unless you order a custom-made trial lens, in which case the choice will depend on the corneal diameter (ØC), corneal eccentricity (e) and palpebral opening :
Large Diameter for snapping fit
Small diameter for inter-palpebral fit
Choice of radius of curvature (r0)
The choice of the r0 of the first trial lens depends on the corneal keratometry :
Evaluation of fit
After fitting the trial lens, wait 30 minutes before proceeding with a fit assessment
Ideal fit
A fit assessment always begins with an observation of the central zone
1 – Central zone (Static observation, lens centered)
Tight Fit
Possible solutions : Try a flatter radius.
Poor Fit
Possible solutions : Try a tighter radius
2 – Centering and mobility
The evaluation of centering, mobility and periphery should only be done after finding the r0 which gives the best alignment in the center.
Centering (static observation)
The lens must be centered; a shift lower is tolerable as long as the lens does not cross the limbus.
Mobility (dynamic observation)
The lens should exhibit slight movement after blinking, with the lens moving up, then slowly refocusing.
3 – Periphery
Trial BioFlex SA lenses have a standard peripheral clearance (d). Depending on observations it can be adjusted by ordering a tighter or flatter clearance.
Over-Refraction
Internal toroidal fit: BioFlex SA TI
