Orthotic
A support, brace, or splint used to support, align, prevent, or correct the function of movable parts of the body. Shoe inserts are orthotics that are intended to correct an abnormal or irregular walking pattern, by altering slightly the angles at which the foot strikes a walking or running surface. Other orthotics include neck braces, lumbosacral supports, knee braces, and wrist supports.
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- Os
The left eye (oculus sinister), as opposed to the right eye (oculus dexter).
- OS (lens prescription)
Abbreviation of “oculus sinister.” Latin for “left eye.” By contrast, OD stands for “oculus dexter” which is Latin for the right eye.
- Os sacrum
The large, heavy bone at the base of the spine. The os sacrum is symmetrical and roughly triangular in shape. The female sacrum is wider and less curved than the male sacrum, to permit easier childbearing.
- OSA (obstructive sleep apnea)
Abbreviation for obstructive sleep apnea (and also for the Optical Society of America).
- Oscillopsia
Oscillating vision. Swinging vision. In oscillopsia, objects seem to swing, move back and forth, jerk, or wiggle. A classical language hybrid derived from the Latin oscillo, to swing, + the Greek opsis, vision.