A | B |
0.03 | Each blink is for _ seconds |
6 | # of muscles control each eye's movement |
30 | Blinking allows the eye to close approx _ minutes each day |
1/6 | What percent of the eye is open to external environment? |
2 to 10 | We blink every _ to _ seconds |
Accommodation | Process whereby the lens changes shape to see objects at various distances |
Aqueous Humor | Fluid in the eye that bathes the anterior region |
Bent | As light passes through the lens, it is _ |
Change | To focus light, the lens must _ its shape. |
Conjunctiva | Membrane that lines the eyelid and covers the anterior of the eye |
Convergence | Simultaneous inward movement of both eyes (towards each other) in order to produce a single binocular vision of an object |
Crystalline Lens | Adjusts the thickness and shape of the lens (refraction) |
Ear & Eye | Two sense organs |
Elasticity | With aging the lenses lose some _ |
Emmetropia | Normal vision |
Fovea Centralis | Area of sharpest vision |
Lacrimal Ducts | Tear ducts |
Lens Accommodation | Changing of lens shape |
Macula Lutea | Yellow spot in the center of the retina that contains the fovea centralis |
Optic Disk | Region where optic nerve meets the retina and is insensitive to light |
Optic Disk | Blind spot |
Optic Nerve | Nerve carrying impulses - traveling to and from the brain |
Reading Glasses | Provide additional refraction the lenses can no longer provide. |
Refraction | Bending of light rays (focusing) |
Refraction | Focusing |
Sense Organ | Receptors with sensitive cells activiated by a form of energy or stimuli in the internal or external environment |
Snellen Chart | Rows of letters to be read from top to bottom - with gradual decrease in the size of lettering |
Visual Acuity | Sharpness of vision tested with a Snellen chart |
Vitreous Chamber | Cavity behind the lens containing vitreous fluid |
Vitreous Chamber | Maintains shape of eyeball |