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If they correct for far distance, the person must accommodate to see up close. If the person cannot accommodate, they may need a separate correction for near distances, or else use a multifocal lens (see below). Reading glasses are single vision lenses designed for near work and include over the counter glasses.
However, active lenses, which are also able to amplify light at certain wavelengths, are much more flexible in how they can 'correct' color vision and impose bigger shifts of color. Smart glasses like the Google Glass and Epson Moverio can act like active lenses and have been used with re-coloring apps to help the colorblind with color tasks.
Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...
Implantable contact lenses correct vision, including extreme nearsightedness; stay in the eye without maintenance. Patient describes experience with EVO lens. Eye Vision Correction: Permanent ...
Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism .
Cover one eye; read the letters aloud. Cover the other eye; read the letters aloud. Ah, the standard eye exam. A few lines of text and the doctor can tell you whether you have poor vision. But let ...