00:00
The eye is, well I think, one of the most
fascinating organs in the body,
and I am going to leave it to the neurophysiologists
and the ophthalmologists
to explain all the detail physiology and
also some of the anatomy of the eye.
00:20
But in this lecture I am going to describe
only major components of the eye.
00:27
I am going to outline the histological
structure and then indicate what
functions each of those structures have
in the whole function of the eye, giving us
vision. At the end of the lecture, you need
to understand or at least identify the
structures that I am going to talk about. You
need to understand the role of the
cornea and the lens in focusing light on the
retina, and the role of the iris in being
a diaphragm and restricting or opening the
amount of light going through the pupil
to the retina. And I am going to describe
the muscles that change the dimensions
of the pupil and you need to understand the
function of those muscles as well. I am
also going to describe the production of the
aqueous humor by the epithelium of
the ciliary processes and how that
aqueous humor circulates through the
posterior and anterior chambers of the eye
and finally how it's absorbed into the
canal of Schlemm. So it is important for
you to understand all those processes.
01:42
You need to understand the role of the
retina in particular to be able to
identify the rods and the cons and
understand a little bit about their
functions. And also I want you to be able
to understand the cause of presbyopia,
which is a condition of ageing of the
lens and then also what constitutes the
blind spot.
02:07
Well as I said let us start this lecture of the eye,
is probably the most fascinating organ in the body.
02:16
The cornea and the lens focus light on the
retina, the illumination is adjusted by
the iris, the rods and cons are the
receptors the photoreceptors that send
impulses to the brain to enable us to
see, to have vision and then
extraocular muscles which I will not describe
in this lecture, I will leave that to the
anatomist. The extraocular muscles
actually move the eye and they are
coordinated by very precise impulses
coming from the brain. But as I said
only that to the anatomist to describe
for you.