23 September 2015 Wide field-of-view bifocal eyeglasses
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Abstract
When vision is affected simultaneously by presbyopia and myopia or hyperopia, a solution based on eyeglasses implies a surface with either segmented focal regions (e.g. bifocal lenses) or a progressive addition profile (PALs). However, both options have the drawback of reducing the field-of-view for each power position, which restricts the natural eye-head movements of the wearer. To avoid this serious limitation we propose a new solution which is essentially a bifocal power-adjustable optical design ensuring a wide field-of-view for every viewing distance. The optical system is based on the Alvarez principle. Spherical refraction correction is considered for different eccentric gaze directions covering a field-of-view range up to 45degrees. Eye movements during convergence for near objects are included. We designed three bifocal systems. The first one provides 3 D for far vision (myopic eye) and -1 D for near vision (+2 D Addition). The second one provides a +3 D addition with 3 D for far vision. Finally the last system is an example of reading glasses with +1 D power Addition.
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Sergio Barbero, Sergio Barbero, Jacob Rubinstein, Jacob Rubinstein, } "Wide field-of-view bifocal eyeglasses", Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 962614 (23 September 2015); doi: 10.1117/12.2184596; https://doi.org/10.1117/12.2184596
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