WHAT IS BI–ASFERA?
Bi-Asfera is the ideal single vision lens for people who need high performance of vision and correction. It not only
eliminates the deformations that may occur in the peripheral areas, but also prevents the eye from appearing larger or
smaller depending on the prescription dioptries. All these benefits are offered by the aspherical design on both the front
and back surfaces of the lens.
Astigmatism, which occurs as a result of corneal curvature, causes these people to see objects as deformed. Sometimes
a point can appear in the form of a line, sometimes in the form of a flat earth from the poles of a completely round
shape. In this case, an exact replica of the object viewed on the retina never occurs. The use of a spherical design lens
also does not eliminate this deformation.
BENEFITS of BI–ASFERA?
In the production of Bi-Asfera single vision lens, it is ensured that the visual field is expanded and the performance of
vision is increased by using aspheric semi-finished blanks and aspheric surface design processed on the back surface. In
Bi-Asfera, developed by NOVAX, it is aimed to prevent deformations especially in the peripheral areas and to achieve a
more aesthetic lens by optimizing both the front and back surface aspheric structure.
WHY SHOULD WE USE BI-ASFERA?
STANDARDCONVEX LENSES
In a spherical designed lens, as you go to the peripheral area, the eye begins to perceive numbers outside the prescription dioptries, which causes serious image deformations in that area.
+10,00D Standart & Bi – Asfera Lens Comparison
Bi-Asfera design, the perceived prescription remains almost the same as the prescription on the entire surface of the lens, thus minimizing image distortions.
HOW TO FIT BI–ASFERA LENS?
The optical axis of the lens must pass through the eye's center of rotation.
The following way is applied for fitting height measurement:
If you are not measuring the pantoscopic angle of the patient, according to the average pantoscopic angle calculation, fit the Bi-Asfera lenses 4 mm below the pupil.
If you have measured the pantoscopic angle of the patient, fit the Bi-Asfera lenses according the pantoskopic angle value time 0.5 mm below the pupil height. E.g., if you measured the pantoscopic angle value as 10, fit the lenses 5mm below the pupil height.