Bifocal Lens Design Explained - Near and Far Vision Zones #2008292 (License: Personal Use)

This schematic illustrates a traditional bifocal lens design, where the upper portion is optimized for far sight (distance vision) and the lower “D-segment” is dedicated to near sight (e.g., reading). The visible line between segments indicates the demarcation used in standard fused bifocals. Such lenses are commonly prescribed for individuals with presbyopia who require clear vision at multiple distances without switching glasses.

Used on optometry, ophthalmology, or eyewear retail pages to explain lens types; matches user intent seeking information about bifocal functionality, prescription options, or visual correction solutions.