op-, opt-, optico-, opsi-, opso-, -opia, -ops, -opsia, -opsis, -opsy, -optic, -opic, -opy +

A specialist in fitting eyeglasses and making lenses to correct vision problems.

Optometrists performs eye examinations and writes prescriptions for corrective lenses; opticians fill those prescriptions.

The application of the art and science of optics to the compounding, filling, and adapting of ophthalmic prescriptions.

The second cranial nerve; the sensory nerve that innervates the retina.

Acute impairment of vision in one eye or both eyes, which may be affected simultaneously or successively; and which may recover spontaneously or leave the patient with a scotoma or scotomas; or even blindness.

Scotoma refers to an area of lost, or depressed vision, within the visual field; surrounded by an area of a less depressed, or of normal, vision.

Referring to the optic and facial nerves.

A collector of eye glasses.

1. The branch of physics that deals with light and vision; primarily, the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves.
2. When referring to a singular noun, it means, the study of light or electromagnetic radiation in the visible, infrared, and ultraviolet regions.
3. As a plural noun, it refers to instruments used for detecting electromagnetic radiation and for attaining highly accurate long-range vision.

An image of external objects fixed on the retina by the photochemical action of light on the visual purple.

1. The production of an optogram on the retina by the photochemical action of light on the visual purple.
2. The fixation of an image in the eye.

Referring to movements of the eyes.

An instrument for measuring the distance of distinct vision, mainly for the selection of eve glasses.

A health care professional who is licensed to provide primary eye care services:

1. To examine and diagnose eye diseases such as glaucoma, cataracts, and retinal diseases and, in certain states in the U.S., to treat them.
2. To diagnose related systemic (bodywide) conditions such as hypertension and diabetes that may affect the eyes.
3. To examine, to diagnose, and to treat visual conditions; such as, nearsightedness, farsightedness, astigmatism, and presbyopia.
4. To prescribe glasses, contact lenses, low vision rehabilitation, and medications; as well as, to perform minor surgical procedures; such as, the removal of foreign bodies.

1. The professional practice of primary eye and vision care that includes the measurement of visual refractive power and the correction of visual defects with lenses or glasses.
2. The practice of non-medical eye care, dealing primarily with the testing of vision for refractive errors and with the prescription and fitting of corrective lenses.
3. The professional practice of eye and vision care for the diagnosis, treatment, and prevention of diseases and conditions of the eyes and visual systems.
4. The practice of examining eyes in order to determine levels of vision and then prescribing and supplying any necessary corrective lenses.

A device for measuring eye muscle balance and vergence (inward or outward turning of both eyes when they are focusing on an object).

An instrument to enable one to hear the murmur of muscular contractions.