Hydrogel contact lenses, Quaterly , Custom lens

  • Increased comfort
  • Exceptional visual acuity
  • Better oxygenation of the cornea
  • High wettability
  • No parameter limits
  • Myopia
  • Hyperopia
  • Astigmatism
  • Presbyopia
  • Three-monthly
  • Daily wear


The only soft Silicone Hydrogel contact lens manufactured by digital filming in Morocco. Available as spherical, toric and multifocal, and without parameter limits.

It has the highest DK of lenses manufactured by filming. With its strong hydrophilicity too, it offers the wearer comfort, vision and a better oxygen supply while wearing.


Choice of the definitive lens

BioXtra lenses are custom-made, so provide us with the following data:

Corneal diameter (HVID)
Corrected Glasses

For Multifocals we will also need:

The dominant eye
Pupillary diameter
Addition in VP

Rules for fitting

You can choose the parameters of the lenses (without guarantee of fit), by applying the following rules :

LC diameter = Corneal diameter (HIVD) + 2 mm
Radius: Depending on the total diameter:
13.50: R0=Km+0.1         14.00: R0=Km+0.2
14.50: R0=Km+0.3         15.00: R0=Km+0.4
Convert glasses strength into contact lenses taking into account the glass-eye distance

Evaluation of fit

After insertion, wait 5 to 10 minutes before evaluating the fit.

A well-fitting lens:

Shows 0.5 to 1 mm blinking movement
On “push up” the lens refocuses quickly
Its edge is 1 to 1.5 mm from the limbus
Is comfortable

Poor fit

Blurred vision after blinking
Excess mobility
Axis rotation with toric lenses
Induced astigmatism with additional refraction

Recommended Actions:
Increase the diameter by at least 0.50 or tighten R0 by at least 0.2 mm

tight fit

Clear vision after blinking
Reduced mobility
Axis rotation for toric lenses

Recommended Actions:
Decrease the diameter by at least 0.50 or flatten R0 by at least 0.2 mm

Cyl axis rotation

In toric lens, check the marking of the axis which must be at 6 o’clock, and in case of rotation note the position.

Recommended actions:
If you communicate the rotation to us, lenses under warranty will be redone taking into account this parameter.

Fit for multifocals

Multifocal lenses require an adjustment time of at least 4 days of regular wear.
The patient must be motivated and aware that there is a trade-off between wearing contact lenses and good depth of field.

Fit Protocol

VL : Correction with maximum convex
VP : Minimum addition in binocular

Determination of the dominant eye:

  • The subject wears his best correction in VL, and binocularly fixes the optotype from a distance,
  • Alternately place a +0.75 lens in front of each eye and ask the wearer when they are most uncomfortable.
  • The most uncomfortable eye is the dominant eye.

On delivery check the centering and mobility of the contact lens


Radius of curvature  7.00 to 12.00 mm by 0.1
Diameter 12.00 to 20.00 mm by 0.1
Sphere +20.00 to -30.00 D by 0.25
Cyl Up to 10.00 D by 0.25
Axis 0° to 180° by 1°
Addition Up to 4.00 D by 0.25


Material DEFINITIVE (Efrofilcon A)
Classification Filcon v 3
Hydrophilicity 74%
DK 60
Modulus 0.35 MPa
UV Filter Yes
Handling color  Blue



We recommend the preservative-free soft contact lens care solution Regard®

See product




Biolens Lab offers a 1-month guarantee of fit for BioSoft lenses, on the condition of communicating the keratometry, or any other parameter necessary for determining the final lens.

If the parameters are defined by the prescriber, no returns can be accepted.