All other progressive lens designs limit the vertical and horizontal design components to the same side of the lens. Only HOYA customizes the lens on both sides for a personalized vision correction.
Step 1: Calculating the unique front and back surfaces Vertical Positioning: Vertical Progressive Components are positioned on the front of the lens to minimize eye movement when transitioning from far to near distances. Reducing the rotation of the eyes when looking from distant to near zones makes the wearer more comfortable. Horizontal Positioning: Horizontal Progressive Components are positioned on the back of the lens to bring the unwanted astigmatic powers closer to the eye, reducing the effect on peripheral vision and producing wider, undistorted visual fields at all distances, regardless of the prescription.
Step 2: Customizing the separate design properties Virtual vision evaluation and calculation techniques are used to map Skew Deformation, analyzing the unique “swim effect” experienced by each eye, and Point Deformation mapping, which quantifies the deformation at each point in the visual field of the progressive lens.
Step 3: Integrating the two surfaces our proprietary computer evaluation, Balanced View Control, tracks the movement of objects across the retina to identify any “bending” effects the wearer perceives along straight lines or flat surfaces. To do this, the Balanced View Control simulation creates a central “target” image composed of many small circles, then gradually moves each circle away from the center, identifying those that become ellipses due to Skew Deformation. The system then corrects the image at all deformation points, ensuring the clearest vision in all directions.