Full transcript
0:00so here looking at the structure of the
0:03eye and the sense of sight let's go
0:05through each component uh first the I
0:08starts with What's called the sclera and
0:11the sclera is here and it's known as the
0:13whitish portion of the eye moving down
0:16that takes us into the pupil pupil sits
0:20right in the middle and that's generally
0:21when someone is having an eye exam it is
0:25very common for the provider to look at
0:27the dilation and constriction of the
0:29pupil here you have What's called the
0:32cornea cornea is the clear covering in
0:35the center of the eye it's essentially a
0:37shield that protects the eye from damage
0:41thus cornea abrasions very common uh
0:45because it is a covering for the eye it
0:48can become
0:50tattered and and uh injured the iris the
0:54iris is the colored portion of the eye
0:56it's located here you can see it in the
0:59blue and then you have What's called the
1:01retina the retina sits in the back
1:04and it captures the vision input
1:08and notice here you also have the optic
1:11nerve the optic nerve is what speaks to
1:14the brain as far as being able to take
1:16in uh visually the site send it to the
1:19brain for the brain to transpose it and
1:22tell us in fact what it is that we're
1:23looking at that's all done through the
1:25optic nerve conjunctiva you've probably
1:28heard this word from conjunctivitis it
1:31is a clear coating on the outside of the
1:33eye conjunctivitis is when the
1:35conjunctiva becomes inflamed or infected
1:38with that typically what we see is the
1:41drainage the redness in the in the eye
1:43maybe itching associated with that but
1:46it is a clear coating and then you have
1:49the lens of the eye the lens is located
1:51here in this area and the lens is what's
1:54responsible for capturing uh objects so
1:59it captures what it is that we're
2:00looking at allows our eye to try to
2:04develop some sort of focus around it
2:06depending on what your eyesight is if if
2:08you're nearsighted or farsighted that's
2:10occurring within the lens so two terms
2:13over here in red we have accommodation
2:14and refraction and accommodation is the
2:18ability of the lens to change shape so
2:22for some individuals uh if you have
2:24astigmatism astigmatism changes within
2:28the lens and so the lens tends to alter
2:31things that may be in a circular form it
2:34makes them more of an oval type shape
2:36that would be accommodation refraction
2:39refraction is the bending of light that
2:42enters the eye to focus it on the retina
2:45corn the cornea is what performs this
2:48function and allows again assistance and
2:51being able to take in images uh and
2:56um refract the bending of the light so
2:58that we can actually see things and
3:01transpose those messages through the
3:03optic nerve you've got ciliary muscles
3:06there and then you also have your
3:08eyelashes and your eyelashes just like
3:10the hair anywhere else on your body it's
3:12we call them eyelashes it's actually
3:14cilia same purpose here is to repel
3:19bacteria to keep pathogens and bacteria
3:22from entering into your eyes all of this
3:25is a mucous membrane and so it is
3:28susceptible to bacteria and it's an easy
3:31way right into your bloodstream so your
3:33eyelashes do assist with with keeping
3:36you well and keeping you healthy