Exercise 24: Special Senses: Visual Tests and Experiments Flashcards
Explain why vision is lost when light hits the blind spot.
This area lack photoreceptors
What is the term for light bending?
Refraction
What is the term for the ability to focus for close (less than 20 feet) vision?
Accommodation
What is the term for normal vision?
Emmetropia
What is the term for the inability to focus well on close objects (farsightedness)?
Hyperopia
What is the term for nearsightedness?
Myopia
What is the term for blurred vision due to unequal curvatures of the lens or cornea?
Astigmatism
In farsightedness, the light is focused _____ the retina. The less required to treat myopia is a _____ lens. The near point of vision increases with age because the _____ of the lens decreases as we get older. A convex lens, like that of the eye, produces an image that is upside down and reversed from left to right. Such an image is called a _____ image.
Behind; concave; elasticity; real
During distance vision, the ciliary muscle is _____, the ciliary zone is _____, the convexity of the lens is _____ and light refraction is _____. During close vision, the ciliary muscle is _____, the ciliary zone is relaxed, lens convexity is _____, and light refraction is _____.
Relaxed; taut; decreased; decreased; contracted; relaxed; increased; increased
How can you explain the fact that we see a great range of colors even though only three cone types exist?
The other colors that we see are caused by the overlap of three primary cones: the colors we see are combinations of blue, green, and red
What is the advantage of binocular vision?
Binocular vision provides 3-D vision and depth perception
What factor(s) are responsible for binocular vision?
The eyes at the front of the head and the ability of the visual cortex to resolve two different views into a single image
What pathological conditions can be detected with an ophthalmoscopic exam?
Diabetes, arteriosclerosis, and degeneration of he optic nerve and retina
