Digital Ray-Path® lenses offer superior vision because they reduce oblique aberration. Oblique aberration is an optical effect that is present in all ophthalmic lenses, and it reduces the wearer’s visual acuity. Digital Ray-Path® drastically reduces the amount of oblique aberration at every point of the lens. The resulting effect for the wearer is better vision in all zones of the lens.
 
 

Removing Oblique Aberration

Oblique aberration is the focusing error, including astigmatic error, that is experienced by a wearer when looking through an area of the lens that is significantly away from the center. This adverse optical effect is caused by the way that light propagates within the lens at oblique angles, hence the name oblique aberration. It is difficult to compute, and requires detailed simulation of light propagating through the lens and into the eye. Besides chromatic aberration, it is the main optical effect that limits the performance of ophthalmic lenses. Fortunately, the combination of digital surfacing technology and Digital Ray-Path® can drastically reduce oblique aberration.

Eye looking in a lateral direction

Oblique aberrations appear when the wearer is looking peripherally, through a portion of the lens that is away from its center. In those cases, the image is not focused on the fovea and the wearer will see the object out of focus, vision will be blurred, and visual acuity will be reduced.

 

Eye looking through lens center

When the user is looking through the center of the lens, there is no oblique aberration, and the image remains focused on the fovea. Conventional lenses are designed to perform well only in this central direction of sight.
 


How Oblique Aberration Impacts Visual Experience

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Oblique aberrations become more pronounced as the eye looks further away from the optical center of the lens. Oblique aberration produces blurred vision and a loss in visual acuity. Digital Ray-Path® compensates for this effect by calculating the necessary complex lens surface that will counteract oblique aberration in each gaze direction. The result is a fully optimized lens, offering wider visual fields for the wearer and clearer definition from center to edge.
 

Achieving Larger Visual Fields

Removing oblique aberration is important in both single vision and progressive lenses.

 

Single vision lens

In a single vision lens, oblique aberration limits the clear visual field to the central area of the lens.
 

Progressive Lens

In progressive lenses, oblique aberration has a greater negative effect, because fundamental areas of the lens, specifically the near vision zone and the progression channel, are always away from the lens center.
 
Digital Ray-Path® is able to minimize oblique aberration point by point, allowing a wider, sharper field of view.   Therefore, the improvement provided by Digital Ray-Path® removing oblique aberration is even more important in progressive lenses.
 
SV lens with oblique astigmatism Optimized SV lens without oblique astigmatism
 
Oblique aberration reduces the progressive visual fields, especially in the near vision. With Digital Ray-Path®, the clear visual fields are wider, due to its ability to correct oblique aberration in all gaze directions.

Variable Inset Optimization

In progressive lenses, the inset is the horizontal shift of the reading area towards the nose, with respect to the distance reference point. The inset is an important value that has been ignored for a long time. Every person needs a different inset to maximize the binocular near visual field. The correct inset value depends on the prescription, pupillary distances and near working distance. In Digital Ray-Path® lenses, the inset is exactly calculated for each wearer, taking into account all the individual’s parameters.
The variable inset is just one more factor that improves the near visual field for the wearer.

Inset Calculation Parameters

• Near working distance (s)
• Nasopupilar distance (NPD)
• Prescription
• Back Vertex Distance (BVD)
 

Inaccurate Calculation

Insufficient binocular performance due to wrong inset calculation. Usable reading area is smaller.
 

Correct Calculation

Proper and accurate inset calculation makes for a larger and more comfortable reading area

 

Personalization for High Prescriptions and Sport Frames

In high prescriptions and sport frames, the effect of oblique aberration becomes more pronounced.
In these situations, lens optimization with Digital Ray-Path® is even more essential.
Oblique aberration is the reason it is often difficult for wearers of conventional lenses to adapt to their new sport frames, especially if they have a significantly high prescription.   Digital Ray-Path® technology is just as effective on extreme prescriptions and curved frame shapes, providing sharp visual acuity in all gaze directions and fast wearer adaptation.

Oblique aberration in high prescriptions

In high prescription lenses, oblique aberration becomes more severe from center to edge, compared to low or medium prescriptions.

High prescription wearers, whether myopic, astigmatic or hyperopic, may find very limited clear visual fields in lenses that are not optimized. The higher the prescription, the more the wearer will notice the advantages of Digital Ray-Path®.
 

Oblique aberration in sport frames

Removing oblique aberration is especially important in curved wrap frames. Uncompensated oblique aberration is the reason why some wearers feel uncomfortable when they are using their prescription lenses fitted in a high wrap frame.

In conventional lenses, oblique aberration reduces the clear visual field, and wearers feel like they can only see clearly through the center of lens. Digital Ray-Path® can easily correct the effects of high curvature and wrap and provide an improved visual experience for users of sport frames.

The best vision in any gaze direction

Digital-Ray-Path® expands the clear visual field to the whole lens. Oblique aberration is minimized, offering the wearer the best quality of vision through every point of
the lens.
With Digital Ray-Path®, there are no limitations in frame selection. The lens will always be optimized and the wearer will have clear and comfortable vision.

 

Frame Flexibility

Wearers can choose any frame they like,
without restriction
 
Digital Ray Path® lenses, both progressive and single vision, provide excellent vision for any wearer, regardless of the frame that is selected. The Digital Ray-Path® optimization process provides new freedom in frame selection. The lenses are completely personalized for each frame, so there are no longer frame limitations imposed by the prescription. No more worries if a high myopic wearer wants to choose a sport frame. Even in such an extreme cases, with a high base curve and high addition, the wearer will have excellent vision in any gaze direction. Additionally, Digital Ray Path® lenses can be calculated with automatic de-centration to improve the final thickness of the lens. The final lens diameter will be perfectly calculated for the specific frame selected.