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Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
X-ray specs or X-ray glasses are a pair of spectacles that claim to let users see through or into solid objects, but actually use diffraction lenses or feathers to create an illusion. Learn about the history, marketing themes and similar devices of this American novelty item.
Learn about different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eyecare professionals. Find out how to choose the right lens for your vision needs, whether it is single vision, bifocal, trifocal, progressive, or multifocal.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.
Pinhole glasses are eyeglasses with pinhole-sized perforations that reduce the size of the circle of confusion on the retina and increase depth of field. They are claimed to be useful for people with refractive error, but they also reduce brightness and peripheral vision, and are not recommended for driving or operating machinery.