lesson 6 correcting vision defects

Question 1

long sightedness occurs when the lens is what

Answer 1

in the wrong shape and doesn’t refract the light enough
or
when the eyeball is too short

Question 2

in long sightedness the images of near objects are brought where in the retina

Answer 2

behind

Question 3

what type of glasses can you use to fix long sightedness

Answer 3

glasses with convex lenses

(a lens which curves outwards)

Question 4

in glasses with convex lenses, the lens does what

Answer 4

refracts the light rays so they can focus on the reitna

Question 5

what is the medical term for long sightedness

Answer 5

hyperopia

Question 6

short sightedness occurs when the lens is what

Answer 6

in the wrong shape and refracts the light too much
or
the eye ball is too long

Question 7

in short sightedness the images of distant objects are where in the retina

Answer 7

in front of

Question 8

what glasses can you use for short sightedness

Answer 8

glasses with concave lenses

(a lens which curves inwards)

Question 9

why do you use glasses with concave lenses

Answer 9

so that light rays can focus on the retina

Question 10

the medical term for short sightedness is what

Answer 10

myopia

Question 11

what are the 3 alternatives for wearing glasses

Answer 11

contact lenses
laser eye surgery
replacement lens surgery