SINGLE VISION & PROGRESSIVE LENSES
WHY COMPENSATED LENSES?
Digital Ray-Path® compensated lenses are calculated and optimized to all users. This is one of the biggest advantages of freeform lenses. The highest visual acuity and widest visual fields are achieved for all prescriptions and can be manufactured with all base curves and types of material.
WHY IS IT SO IMPORTANT FOR MY PATIENTS TO HAVE COMPENSATED LENSES?
Oblique aberration is a focusing error experienced by users while looking at an area that is away from the optical center. This aberration reduces user visual acuity (VA), thus negatively affecting lens’ visual fields. It is important to compensate and correct the effect caused by oblique astigmatism in single vision and progressive lenses, especially in medium high powers or wrap frames, in order to offer patients high visual definition and wider visual fields.
POWER CALCULATION FOR CONVENTIONAL LENSES
In conventional lenses, power is calculated by taking into consideration that light follows per-pendicular to the back surface of the lens.
Users’ visual experience is less than perfect, especially when looking at lateral gaze directions. In this situation, the light does not follow a perpendicular to the back surface trajectory and produces an oblique aberration that leads to a reduction in visual quality
POWER CALCULATION FOR COMPENSATED LENSES
Digital Ray-Path® technology is based on a simulation of the lens in front of the eye, which takes into account
all wearers’ personalization pa¬rameters (or default values if real values are not provided), and simulates how the eye rotates to look in every direction, at various distances.
Undesired oblique aberration is minimized at each position to improve wearer’s vision by changing the power at the back surface.
HOW TO CHECK A COMPENSATED LENS WITH THE LENSOMETER
Prescribed Power is determined by a doctor’s prescription.
Conventional lenses are calculated to yield this power when
measured with a lensometer (perpendicular to the back surface).
However, when using a lensometer with compensated lenses,
measured power is different from prescribed power
Digital Ray-Path® eliminates oblique aberrations, modifying
power at each point on the lens. Users therefore get the power
they need in addition to better vision in each gaze direction.
Nonetheless, the lens will read a different power when measured
using a lensometer, a difference called Compensated Power.
Digital Ray-Path® lenses display both Prescribed Power and Compensated Power. Compensated Power is the power that must be
checked for quality inspection using the lensometer