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WebJun 1, 2024 · Bifocal lenses contain two optical powers to accommodate clear vision for both near and far. The lens is divided into two segments, the top of the lens contains the distance vision prescription, while the bottom of the lens contains the near vision prescription. Some bifocals contain a bisecting horizontal line between the two lens powers. WebAug 28, 2024 · After thinking about this for a little while, I realized that any short focal length lens will have enough depth of field to focus on a nearby object (less than 8 inches. So, according to this idea, any glasses with a focal length optimized for 4-12 inches or less (reading glasses) should bring the viewfinder image into sharp focus. Is this ... WebMar 1, 2024 · Bifocal and trifocal glasses feature a sharp edge between the close-up and far-off part of the prescription. It’s a harsher change, whereas multifocal lenses offer a progressive or gradual transition. Bifocals Bifocal contact lenses and glasses offer two distinct optical powers. great clips woodland park