Digital Ray Path

Better vision on every point of the lens


Digital Ray-Path® simulates the optical behaviour of the lens when it is placed in front of the wearer’s eye. Algorithms then compute the negatively-impacting oblique aberrations and subsequently reduce them at every point of the lens. By taking into account the ocular rotation and the placement of the lens relative to each point of the eye’s rotation, Digital Ray-Path® creates a unique lens for each individual to provide optimal visual performance.

How it Works

Digital Ray-Path® computes the back surface of the lens with an algorithm to optimize the lens while considering the combination of prescription, physiological parameters and frame measurements.

Step 1

Eye-Lens System

Digital Ray-Path® prepares a simulation of the lens in front of the eye with all of the wearer’s lens and fitting parameters.

Step 2

Space Object

Digital Ray-Path® uses an algorithm to optimize all visual zones of the lens.

Step 3

Ray Tracing

By simulating each point of the eye’s gaze and rotation, the Digital Ray-Path® algorithm computes the compensation of thousands of ray tracings to minimize the oblique aberrations at each point across the entire back surface.

Individual Personalization

Personalization parameters used for the calculation are specific for each individual wearer. Those parameters represent the identity of each wearer and make it possible to create unique lenses.

1. Prescription

Digital Ray-Path® calculations result in the compensated power that the user will truly perceive once the lenses are fitted on the frame.

2. Naso-pupillary Distance (NPD)

Is defined as the distance from the axis of symmetry of the face to the center of the pupil.

3. Pupillary Heights

Is the vertical distance between the pupil center and the deepest part of the lens.

4. Frame Dimensions

Frame dimensions are used to calculate and improve the efficiency of the optimization.

5. Pantoscopic Angle

This is the angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in primary position of gaze.

6. Wrap Angle

Also known as frame curvature.

7. Back Vertex Distance (BVD)

Distance in mm between the cornea and the back surface of the lens.

8. Near Working Distance

This is the distance from the lens surface to the near task/ reading position.

9. Variable Inset Optimization

Digital Ray-Path® enables the inset to be optimally calculated for each wearer to maximize the binocular near visual field.

10. Optimizing for High Rx

The benefits of Digital Ray-Path® technology is most evident in lenses of higher prescriptions and frames with higher base curves where the effect of oblique aberration becomes more pronounced.

Prescribed Power vs Compensated Power

Prescribed Power

Prescribed Power is the prescription given by the doctor. Conventional lenses are calculated to yield this power when being measured on a lensometer. However, when the wearer is looking through different points of the lens, oblique aberrations appear reducing the wearer ́s visual acuity.

Compensated Power

Digital Ray-Path® gets rid of those aberrations, modifying the power on each point of the lens. As a result, the user gets the power they need, and better vision, in each gaze direction. But the lens will read a different power when measured on a lensometer. This different power is called Compensated Power. Digital Ray-Path® lenses will display both the Prescribed Power and the Compensated Power. The Compensated Power is the one that has to be checked on the lensometer for quality inspection.