human eye and diseases

Question 1

what is the outer layer of human eye

Answer 1

consists of cornea and sclera

Question 2

which parts constitute the middle part of the human eye

Answer 2

iris
ciliary body
choroid

Question 3

what is the middle part of the eye called

Answer 3

uvea which consists of iris, ciliary body and choroid

Question 4

what is the role of ciliary body

Answer 4

The ciliary body produces the fluid that fills the front part of the eye and helps to maintain the shape of the eye

Question 5

role of choroid

Answer 5

The choroid is a layer of blood vessels that supplies nutrients to the retina and helps to maintain the temperature of the eye.

Question 6

what is iris

Answer 6

The iris is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil.

Question 7

what is the inner layer of the eye

Answer 7

retina

Question 8

why is the cornea transplant successful

Answer 8

because it lacks blood vessels

Question 9

what is known as the white of the eye

Answer 9

sclera

Question 10

with which trigger does the size of the pupil changes

Answer 10

it increases or decreases based on the availability of light

Question 11

what is meant by the accomodation power of the eye

Answer 11

the curvature of lens can increase of decrease as per requirement of the distance of the object.

Question 12

what is the range of accomodation for human eye

Answer 12

around 15 dioptre i.e. can see something at infinity all the way down to 25 cms away

Question 13

from which part does light rays enter eyes

Answer 13

pupil

Question 14

what do rods and cones do in retina

Answer 14

rods differentiate between light and dark and cones between different colours

Question 15

what kind of lens is lens

Answer 15

a biconvex lens

Question 16

in which parts do the lens divide the cavity of eye

Answer 16

aqueous chamber and vitreous chamber

Question 17

what happens in glaucoma

Answer 17

when the amount of humour in eyes increases, it creates pressure and damages retina

Question 18

what kind of image is formed on retina

Answer 18

real and inverted

Question 19

what is the name for far sightedness

Answer 19

hypermeteropia

Question 20

what happens in hypermeteropia

Answer 20

person able to see far objects but not near. defected image formed behind retina

Question 21

what kind of lenses are required for hypermeteropia

Answer 21

convex

Question 22

what is the relation between hypermeteropia and presbyopia

Answer 22

in old age, hypermeteropia can occur due to reduction in flexibility of lens or cilliary body

Question 23

where is the image formed in hypermetropia

Answer 23

behind the lens

Question 24

what is the name of near sightedness

Answer 24

myopia

Question 25

where is the image formed in myopia

Answer 25

before the retina

Question 26

what happens in myopia

Answer 26

person can see things near him but not far

Question 27

what kind of lenses are used for myopia

Answer 27

concave

Question 28

what happens in astigmatism

Answer 28

curvature of cornea is changed, and light rays cannot focus on one point causing incomplete or blurred vision

Question 29

in the eye, where are light rays supposed to focus for correct vision?

Answer 29

macula lutea

Question 30

which microbe causes trachoma

Answer 30

chlamydia trachamatis

Question 31

what happens in trachoma

Answer 31

infection in the skin tissue surrounding sclera leading to soreness or redness or blurred vision and could lead to blindness. it is the number one cause for preventive blindness.

Question 32

what happens in strabismus

Answer 32

loosening or contraction of any of the 6 skeletal muscles positioning the eye in its orbit. thus, the eye will incline in one direction giving the squint eyes effect or starbismus

Question 33

which part is affected in cataract

Answer 33

lens. it becomes more solid, brown or more flat

Question 34

what is cloudness of lens called

Answer 34

cataract

Question 35

why is presbyopia caused

Answer 35

less flexibility in lens

Question 36

what kind of lenses are used in presbyopia

Answer 36

both convex and concave aka progressive lens