Blue Light Filtration in Digital Progressive Lenses: Mitigating Corridor Chromatic Dispersion & Screen Fatigue

In progressive lens design, Minkwitz's Theorem dictates that the rate of change of unwanted surface astigmatism ($A$) perpendicular to the umbilical corridor ($x$) is directly proportional to the reading addition ($Add$) divided by corridor length ($w$):

$$\frac{\partial A}{\partial x} \approx 2 \cdot \frac{Add}{w} \implies \text{Higher Near Add } (Add = +2.50\ \text{D}) \implies \mathbf{\text{Extremely Narrow Intermediate Corridor}}$$

For a presbyope viewing a wide monitor, an intermediate corridor only $4\text{ to } 6\ \text{mm}$ wide leaves zero tolerance for optical aberrations.

If a progressive lens is surfaced on low-Abbe polycarbonate ($V_d = 30$), Transverse Chromatic Aberration ($TCA = c \cdot F / V_d$) further blurs corridor edges. In addition, unmitigated $450\ \text{nm}$ LED light scatters intensely off pixel borders.surfacing on 1.60 MR-8 ($V_d = 42$) with UV420 in-mass monomer absorption tightens chromatic blur circles by over $40\%$.

For professional desk work, everyday general-purpose progressive lenses are an ergonomic misfit. Occupational Office Lenses sacrifice the distance infinity zone entirely, dedicating the top $70\%$ of the lens to intermediate computer range ($60\text{--}100\ \text{cm}$) and the bottom to near reading, widening the clear field of view by $\mathbf{300\%}$.