The definitions to some commonly used terms in Behavioural Optometry, as well as words we may be using to discuss you or your child's vision problems:
the process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies. Accommodation acts like the “zooming in” mechanism of the eye.
The accommodation reflex is a reflex action of the eye, in response to focusing on a near object, then looking at distant object (and vice versa), comprising coordinated changes in binocular co-ordination, lens shape and pupil size.
the simultaneous inward movement of both eyes toward each other, usually in an effort to maintain single binocular vision when viewing an object. The “cross-eyed” appearance is one of excessive convergence..
occurs when your eyes don't work together while you're trying to focus on a nearby object. When you read or look at a close object, your eyes need to turn inward together (converge) to focus. This gives you binocular vision, enabling you to see a single image.
the simultaneous outward movement of both eyes away from each other, usually in an effort to maintain single binocular vision when viewing an object.
Eye movement control (EMC)
refers to the voluntary or involuntary movement of the eyes, helping in acquiring, fixating and tracking visual stimuli. This control is critical for efficient ball sports and reading.
the thinking concept of left/right position of yourself and others in the environment. It is an organised knowledge of objects in relation to oneself in that given space.
the measurement used to specify ones range of clear vision at different distances.
describes a breakdown or underdevelopment in the relationship of the eyes working together at focusing and alignment.