Eye is not only the most beautiful but also an important sensory organ and window of the soul. Eye is the organ of vision; it has a complex structure which consists of a transparent lens that focuses light on the retina. A protective cavity in the skull called the orbit in which eyeball is set. Among the important parts of the human eye are the cornea, iris, pupil, crystalline lens, vitreous, conjunctiva, sclera, choroids, the macula, retina and the optic nerve. The eye is filled with intraocular fluid; it maintains sufficient pressure in the eye ball, to keep it distended. Anterior and posterior chamber are filled with a fluid called aqueous humour. It is a slightly alkaline in nature, clear, watery fluid with a density higher than water. The volume of aqueous humour in the anterior chamber is about 0.25ml whereas in the posterior chamber is almost 0.06ml. It is constituted of water and traces of other constituents of the plasma. Aqueous humour is produced from the ciliary processes of the ciliary body and a very little …show more content…
Intraocular pressure is determined by the coupling of the production of aqueous humour and the drainage of aqueous humor through the trabecular meshwork located in the anterior chamber angle. The production, flow, and drainage of intraocular fluid are active continuous processes which are needed for the health of the eye. A normal eye produces about 4 ml of fluid per day, which circulates and then drains out of the eye. If the drainage system is clogged or if production of this fluid is raised pressure inside the eye can build up (Albert DM, et al; 1994). If the IOP is very high the rate of aqueous secretion will diminish consequently. It maintains the continuous supply of nutrition of the avascular structures like the cornea and the lens and also carries away their waste products. The most important function is that it helps to maintain a constant intraocular
Regarding to the ocular examination, the patient's visual acuity without optical correction (spectacle) was good 20/20 in both eyes. IOP measurements was 18 mmHg on the right eye and 16 mmHg in the left eye. The pupil was equal, round and reactive to light with no afferent pupillary defect in both eyes. In extarocular movement test, there was limited downward gaze with
Glaucoma is a disease of the eye and it is fluid pressure within the eye rises and if the eye is left untreated the patient might lose vision or maybe even blind. But this disease is generally affects both eyes but although one of their eyes may have more severe signs or symptoms then the other eye. When you have glaucoma there are small spaces in the front of the eye and they are called anterior chamber. There is clear liquid that flows in and out of the anterior chamber and the fluid nourishes and bathes nearby the tissues. And if the patient has glaucoma the fluid dose not drain like it should drain but the fluid drains out of the eye. And this may lead to fluid build up and pressure inside the rises of the eye. Unless the pressure is brought down and controlled and the optic nerves and some of the other parts of the eye might become damaged leading to ...
Sight helps us navigate the world around us more than any of our other senses. In a fraction of a second, our eyes work with our brains to tell us the size, shape, and texture of an object. They also tell us how close it is and if it’s still or moving. The structures of our eyes are incredibly complex, despite how small they are compared to the rest of our organs. The human eyes are extremely delicate. The visible part of the eye is protected by the eyelids and eyelashes, which keep out dirt, dust, and harmful bright light.
An inspection of the modern animal phyla will reveal that eyes are just as diverse as they are complex. Some organisms like the rag worm have pigmented cup eyes while other like he box jellyfish have two lens eyes and two pairs of pigment pit eyes. To account for the diversity in eye structure, we must first examine the eye ‘prototype’, the original structure that was acted upon by evolution. The simplest organ that can be considered an eye is composed of a single photoreceptor cell and a single pigment cell, without any lens or other refractive body (Arendt, 2003). Such organs are know as eyespots, and...
The eyes are one of the most significant body parts. It permits you to do your tasks - drive to the office, buy supplies, and read books. Unfortunately, a number of people only begin to care for their vision only once they already have concerns on their vision. Care for the eye is really important and this article will aid you to see this.
Methods also exist which involve the injection of fluid or air into the vitreous cavity.
Dissecting the cow’s eye helped us to see all the different parts of the cow eye and see how they work and where they are in the eye.
The four main components of the eye that are responsible for producing an image are the cornea, lens, ciliary muscles and retina. Incoming light rays first encounter the cornea. The bulging shape of the cornea causes it to refract light similar to a convex lens. Because of the great difference in optical density between the air and the corneal material and because of the shape of the cornea, most of the refraction to incoming light rays takes place here. Light rays then pass through the pupil, and then onto the lens. A small amount of additional refraction takes place here as the light rays are "fine tuned" so that they focus on the retina.
Fluid circulating inside the front portion of the eye is produced by a structure called the ciliary body, which is located behind the iris. This fluid moves through the opening of the pupil, passes into the space between the iris and the cornea, and drains out of the eye through a tissue called the angle. With glaucoma, the passing of fluid through the angle is either reduced or suddenly stops, and amounts of fluid inside the eye increase. This high fluid pressure hurts the nerve fibers and the eye's optic nerve and causes blind spots. It may lead to blindness in some cases.
and the iris which is the colored part of the eye, it regulates the amount of light
One sub-system under the sensory system is the visual system; the main sense organs of this are the eyes. The eye is the sensory organ that allows us to detect light from external stimuli. When a light ray is detected, the eye converts these rays into electrical signals that can be sent to the brain in order to process the information and giv...
...the surrounding objects. They also assist humans to do their duties in an orderly way without crossing each other’s paths. It is eyes that ferry light to our brains, therefore triggering the learning and communication process; meaning without eyes, people would literally not be visionary.
Have you ever wondered why the sky is blue. Often times I find myself looking up on a clear day, pondering over that question? Why isn’t it green, or red or pink for even that matter. Every day, the human eye blinks more than 23,00 times. The human eye is a complicated organ that performs one of the most important tasks for our body. There are many questions about the eye however. What function do they perform? What happens if we don’t take care of them? How exactly do they work together to help us form images? Exactly how far can they human eye see?
The Eye is the organ of sight. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he/she is really seeing is the light that the object reflects, or gives off.