Mini-Scleral Contact Lens

Increased comfort
Very high permeability material (DK 200)
Totally customizable design (4 zones)
Available in different diameters
Latest generation materials with very high DK
Available in different materials
Accessible for purchase by the public
Delivery in 72 hours
Entropion surgery
Dry syndrome
Lyell-Stevens-Johnson syndrome
Eye burns
Chronic conjunctivitis with corneal epithelial destruction
Bullous keratopathy
Strong ametropia
Inconfort avec les LRPG
Neovascularization due to wearing hybrid lenses
Frequent loss of LRPG lenses
Sports practice
2 years
Daily use


BioSafty, mini-scleral lens with an innovative and totally customizable design. Specially designed to meet the expectations of professionals and give them control to achieve the ideal fit, it is the best choice for irregular corneas, or simple ametropia. The lens passes over the cornea and the limbus to rest on the sclera, offering the wearer great comfort. The BioSafty is available in latest generation materials with the highest DK in the world offering great stability.


BioSafty Design

Geometry of the BioSafty is multi-aspherical, with a design that adapts to all sagittal heights and different corneal diameters, created with 4 adjustable zones:

CZ : Central Zone
PZ : Paracentral Zone
LZ : Limbic Zone
SZ : Support Zone

Each of these zones can be adjusted in steps of 50 µm, making it possible to best optimize the fit.

Choice of the first trial lens

The diameter

Three parameters are involved in the choice of the diameter of the first trial lens: scleral toricity, palpebral opening and corneal diameter ØC

Corneal diameter:

  • For ØC < 11.8 choose the 15.10
  • For 11.8> ØC choose the 16.30

Inter-palpebral opening:
For a small inter-palpebral opening opt for the small diameter (15.10) to facilitate handling.
Scleral Toricity:
For better stability and better centering, opt for the small diameter (15.10), this avoids the interaction of the periphery of the lens with the sclera

Three options for choosing the trial lens deflection

Based on the indicative table provided in the fitment guide
Calculate the deflection using the Medmont E300
Empirical tests (start with the medium deflection lens)

Evaluation of fit

Criteria for a good fit :

BioSafty Adaptée
No corneal contact : clearance or clearance at the center (C) between 100 and 250 µm after 8 hours of wear
No limbic contact (L)
Scleral zone (SZ) aligned with the conjunctiva, neither too open nor too tight

After inserting the lens,  the evaluation goes through:

Observation of fluorescence
Lens diameter / corneal diameter 1.5 to 2 mm
Evaluate the thickness of the clearance at the center (C)  compared to the thickness of the lens (clearance = lens thickness)
Assess paracentral (P) and limbic (L) clearance
Check scleral support in all dials (after 2 hours of wear)

1 – Observation of fluorescence

Immediately after fitting the trial lens, proceed with observation using a slit lamp. In blue light it must be uniform with absence of air bubbles. In the event of the presence of these, immediately remove the lens and put it back after filling it with saline solution.

Petites bulles d'air, tolérable pour continuer l'observation
Grande bulle d'air, réinsérer la lentille en ajoutant du sérum physiologique
Bonne Image fluorescéine
Contact apical, choisir une flèche plus grande de 300 microns

The lens must pass over the cornea and the limbus; the lens must not be in contact with the cornea. In case of contact remove the lens and replace with another with a larger deflection.

2 – Diameter of the lens / corneal diameter

The edge of the lens must be at least 1.5 mm from the limbus.
If a pinguecula is present, check its location relative to the edge of the lens. A change in diameter can avoid contact between the pinguecula and the lens.

Biosafty 16.30
BioSafty 15.10

3 – Evaluate the thickness of the clearance in the center (C)

With LAF in white light and narrow slit between 45° and 60°, evaluate the clearance in the center or the clearance by comparing it with the thickness of the lens or that of the cornea (clearance = lens thickness or 2/3 of the thickness cornea).
The objective is to have a clearance in the center between 250 and 350 µm.

Dégagement au centre idéal
Clairance fine, augmenter la flèche de 200 μ
Grande clairance, réduire la flèche de 200 μ
L'OCT peut  être le moyen le plus précis pour évaluer cette clairance

4 – Assess the paracentral (P) and limbic (L) clearances

Zone Paracentrale (P)

Contact paracentral, essayer un diamètre plus grand ou ajuster avec un P+2

Paracentral Zone (P): In the event of DMP, trauma or post-graft, insufficient or excessive clearance may be observed at the peripheral cornea, which requires an adjustment of the sagittal height in this zone. Order a lens with P+1, P+2, P+3, P-1 or P-2 (each step corresponds to 50 µm). This is only a change of deflection at the level of this zone without inducing a change in the sagittal height of the lens.

Zone limbique (L)

Grand appui limbique, augmenter le diamètre de la lentille
Appui limbique modéré, Augmenter le dégagement limbique de 2 pas, L+2

Limbic zone (L): The support must be only on the sclera, avoiding any contact with the limbus, and fluorescence must be present over 360°. If the limbal clearance is insufficient order a lens with L+1, L+2, L+3 where each step corresponds to a change in limbal deflection of 50 µm.

Dégagement limbique important, réduire de 1 pas: L-1

A large limbal clearance is undesirable; it can be reduced by ordering a lens with L -1, L -2 by 50 µm.

5 – Check scleral support in all positions (after wearing for at least 1 hour)

Appui idéal

The scleral zone (S) must be aligned over 360° with the sclera. This observation should be done after a minimum of 1 hour of wear.

Appui serré, Choisir S+4

If the lens is too tight it will cause compression of the vessels and/or wrinkling of the conjunctiva. Order a lens with a more open clearance from S+1 to S+12 in steps of 25µm.

Appui scléral ouvert, choisir un S-3

If too flat, the SZ will cause discomfort, hyperemia, edema and formation of air bubbles. Order the final lens with a more closed edge-lift from SZ-1 to S -12, in 25 µm steps.

Peripheral toric scleral lens

Appui scléral serrée sur le méridien horizontal et ouvert le vertical, commander une BioSafty TP

The greater the DT, the greater the interaction with scleral asymmetry.
Consider reducing the diameter of the lens first.
Opt for a peripheral toric lens (BioSafty TP) if:

The support is tight only in one meridian
The lens is off-center
Excessive mobility of the lens
Inflections on the lens
Air bubbles
Difficult lens removal

Advantage of a TP

Centered LC
No inflection on the LC
No air bubbles
No localized bleaching on the conjunctiva
No conjunctival folding
Increases comfort
Better optical quality

Order a BioSafty TP (peripheral toric) or a BioSafty TPO (Adjusted by quadrant)


After a complete and satisfactory fit evaluation, over-refraction is performed to determine the power of the final lens. If the deflection of the final lens is different from the trial lens, recalculate the power of the final lens taking into account the change in the base radius and applying the rule 0.1 mm →0.50 D

The Biolens laboratory can do these calculations for you if you send the reference of the trial lens, the adjustments and the over-refraction..

Look for the best visual acuity in spherical only. If the VA is unsatisfactory, correct the astigmatism:

If ast < 1.00 neglect it if the gain in acuity is insignificant.
If ast > 1.00: Do keratometry on the lens to check if there is infection.
If the ast is due to the inflection of the lens: either increase the thickness or opt for a BioSafty TP 
If no inflection: opt for a BioSafty TE

External Toric

Toric scleral lenses have engravings on their surface, to allow for checking the rotation of the axis of astigmatism. Two lines at 3:00 a.m. and 9:00 a.m.
In case of rotation a recalculation of the axis of astigmatism will be necessary.


Diameter 15.50 to 17.50 mm
Deflection 3700 to 6800 by 100 μ
Paracentral Zone (P) Loose : P+1, P+2, P+3 … by 50 μ
Tight : P-1, P-2, P-3 … by 50 μ
Limbic Zone (L) Loose : L+1, L+2, L+3 … by 50 μ
Tight : L-1, L-2, L-3 … by 50 μ
Scleral Support Zone (S) Loose : S+1, S+2, S+3 … by 25 μ
Tight : S-1, S-2, S-3 … by 25 μ
Power Unlimited


Classification Focon III 4 Focon III 5 Focon III 5
Name Roflufocon D Roflufocon E Tisifilcon A
DK 100 125 180
Hardness 75 77 81
Light transmissibility 97% 94% 96%
UV Filter Yes Yes Yes
Tint Transparent Transparent  Transparent


We recommend using a care solution for rigid contact lenses without preservatives Regard K®

See Product


Biolens Lab offers a 3 month guarantee of fit for BioSafty contact lenses