(Solved): Muscles Help Orient, Focus, and Adjust Lighting To Assist in Vision: A. Proper Orientation Of The Ey ...

Muscles Help Orient, Focus, and Adjust Lighting To Assist in Vision: A. Proper Orientation Of The Eyeball: Extrinsic Muscles Adjust the Direction of Gaze of your Eyes So That Light Reaches the FOVEA CENTRALIS. Name the extrinsic eye muscles that are involved when you: Keep your head still and move your eyes to look at your nose.

Keep your head still, looking forward, and then shift your eyes to the left. F

3. Keep your head still, looking forward, and shift focus from looking at something close to looking at something far away. F

1 4. Fixate on an object while moving your head to the left. F

5. Keep your head still, looking forward and then look straight up. R

R

B. Proper Focus of The Object Ciliary Body Muscles and Ligaments Adjust Focus by Changing Lens Shape Accomodation occurs over these distances: Far point of vision 20 feet

infinity Near point of vision 4 inches Ciliary body muscles (relax or contract) to elongate and narrow the lens for far vision. Ciliary body muscles (relax or contract) to allow the lens to shorten and thicken for near vision C. Proper Light Entering the Eye Pupillary Muscles of the Iris Adjust Light Entering the Eye by Changing Pupillary Diameter. Circular muscle

(decreases or increases) pupil diameter. This is accomplished by (parasympathetic or sympathetic) stimulation. Radial muscle

(decreases or increases) the pupil diameter. This is accomplished by (sympathetic or parasympathetic) stimulation. 60