BioFlex S2, rigid gas permeable contact lenses with multi-curve geometry featuring softening of the junctions and a tapered perfectly rounded edge. Thanks to technology the BioFlex S2 has a design that offers maximum comfort to the patient.
Start with :
Choice of lens diameter (ØT)
The diameter of the first trial lens is limited to that offered in the trial box (9.20 or 9.50), unless you order a custom-made trial lens, in which case the choice will depend on the corneal diameter (ØC), corneal toricity (AstC) and palpebral opening:
AstC˂ 1.50 D → ØT ≥ 9.20
AstC˃ 1.50 D → ØT ≤ 9.20
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 toricity:
Evaluation of fit
After fitting the trial lens, wait 30 minutes before proceeding with a fit assessment.
A fit assessment always begins with an observation of the central zone
1 – Central zone (Static observation, lens centered)
Possible solutions : Try a flatter radius
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 S2 lenses have a standard peripheral clearance (d). Depending on observations it can be adjusted by ordering a tighter or flatter clearance.
Internal toroidal fit : BioFlex S2 TI
Spherical lens on a cornea with high toricity
Internal toric lens on a cornea with high toricity