21 i. LensRefines the focus of images on the retina.Lens
22 j. Aqueous humor Provides nutrients to the structures of the eye.
23 k. Vitreous humor. Helps the eyeball stay firm.
24 7. List four health behaviors you can practice every day to keep your eyes healthy. Eat a well balanced diet.Protect your eyes.Rest your eyes regularlyHave regular eye exams
25 8. Explain the difference between myopia and hyperopia. Hyperopia—FarsightednessPerson can see farClose objects appear blurry.Myopia—NearsightednessPerson cannot see far.Person can see closeCompare the shape of the eyeball
26 9. Describe the following vision problems and eye diseases.
27 9a. Astigmatism Cornea or lens is irregularly curved. Makes images appear blurry.
28 9b. Strabismus Muscles of the eyes appear weak. Cause one or both eyes to move off center.Cross-eye:Eyes pull towards the nose.Wall-eyeEye (s) pull away from the nose.
29 9. ColorblindnessRed-green color blindness is very common among males, affecting approximately 7% of the male population. It is much less common in females, affecting less than 1%.
33 9. ColorblindnessRed-green color blindness is very common among males, affecting approximately 7% of the male population. It is much less common in females, affecting less than 1%.If we have 400 students in our high school, with 250 males and 150 females, determine how many students in our school may be colorblind using the above information.
34 MATH PROBLEM ANSWER 250 X .07 = 17.5 150 X .01 = 1.5 = 19 Students
35 9c. Glaucoma:Pressure inside the eye is abnormally high leading to irreversible damage of the retina and optic nerve.Can cause vision loss.
38 9e. Macular degeneration Light sensing cells in portion of the retina directly opposite the lens begin to malfunction.It can cause vision loss.
39 Macular degenerationThe Amsler Grid is often used to monitor diseases affecting the retina, especially macular degeneration. Any abnormal area in the grid, or any change in its appearance should be checked with an eye examination on an urgent basis.
40 10. Describe three other diseases of the eye. StySwelling of a sebaceous gland near the eyelash.Conjunctivitis--PinkeyeInflammation of the thin membrane that covers the sclera lining of the eyelids.Detached retinaPortion of the retina separates from the choroid.