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A monocle is a type of corrective lens used to correct or enhance the visual perception in only one eye. It consists of a circular lens placed in front of the eye and held in place by the eye socket itself. Often, to avoid losing the monocle, a string or wire is connected to the wearer's clothing at one end and, at the other end, to either a ...
This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens. OD is an abbreviation for oculus dexter, Latin for right eye from the patient's point of view. Oculus means eye. OS is an abbreviation for oculus sinister, Latin for left eye from the patient's point of view.
The add segment of the lens for near vision is the D-shaped area. A bifocal is a lens with two sections, separated by a line (see image to the right). Generally, the upper part of the lens is used for distance vision, while the lower segment is used for near vision. The area of the lens that caters to near vision is called the add segment.
Modern glasses, the most dominant form of eyewear. Eyewear is a term used to refer to all devices worn over both of a person's eyes, or occasionally a single eye, for one or more of a variety of purposes. Though historically used for vision improvement and correction, eyewear has also evolved into eye protection, for fashion and aesthetic ...
Monocular lenses are usually red-tinted contact lenses worn over a single (the non-dominant) eye. These lenses are intended to leverage binocular disparity to improve discrimination of some colors. Compared to disparate lenses, one eye is left unfiltered in order to preserve a realistic perception of colors.
When you look to your right, your right eye views distal (i.e. looking through the lens near to the arm of the spectacles) while your left eye views nasal (i.e. looking through the lens near to the bridge). Modern sophisticated progressive lenses are designed asymmetrically for greater patient acceptance and include special designs to cater to ...
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