Lens Design Techniques to Improve Satisfaction in Free-Form Progressive Addition Lens Users

Fundamentals of Progressive Lens Design

A progressive addition lens (or “PAL”) is a type of multifocal lens that employs a surface with a continuously smooth increase in addition (Plus) power. The curvature of the surface increases from its minimum value in the distance zone to its maximum value in the near zone (Figure 1). The total increase in surface power between these two zones is equal to the specified Add power of the lens. Th...

Analytic free-form lens design in 3D: coupling three ray sets using two lens surfaces.

The two-dimensional analytic optics design method presented in a previous paper [Opt. Express 20, 5576-5585 (2012)] is extended in this work to the three-dimensional case, enabling the coupling of three ray sets with two free-form lens surfaces. Fermat's principle is used to deduce additional sets of functional differential equations which make it possible to calculate the lens surfaces. Ray tr...

Intensity control with a free-form lens.

A family of free-form lenses for intensity control is designed. The lens can shape an incident collimated beam with a given intensity distribution I1 into a new collimated beam with intensity distribution I2. No symmetry is assumed for the two intensity profiles. The key idea is that the lens design problem can be formulated and solved in terms of an optimization process involving a specific ac...

Analysis of a Variational Approach to Progressive Lens Design

Clinical assessment of a customized free-form progressive add lens spectacle.

PURPOSE To determine whether there are significant differences in standard clinical measures of vision, progressive addition lens (PAL)-specific vision tests, or subjective ratings and preferences between customized free-form and standard non-free-form PALs in an experienced wearing population. In addition, we aim to determine whether subjective or objective clinical outcomes depend on demograp...