A pupil is the opening in the centre of the eye that allows light to enter the eye and reach the retina, which is the light-sensitive layer of tissue at the back of the eye. The size of the pupil changes depending on the amount of light entering the eye. When it is dark, the …
The iris is the coloured part of the eye that helps control the amount of light that enters the eye. It is a thin, ring-shaped muscular diaphragm that is located between the cornea and the lens of the eye. The size and colour of the iris is determined by the amount of melanin present in …
The choroid is a layer of tissue in the eye, located between the sclera and the retina. It is filled with blood vessels that nourish the retina. The choroid also helps to regulate the temperature of the eye and absorb excess light to prevent glare. It contains a pigment called melanin that gives the eye …
The conjunctiva is a thin, transparent membrane that lines the inside of the eyelids and covers the white part of the eye. It helps to keep the eye moist and healthy and provides a protective layer against dust, dirt, and other foreign particles. The conjunctiva also contains blood vessels that help to nourish the eye …
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. It is made up of five layers and its main function is to refract light and focus it on the retina. The cornea is responsible for about 70% of the eye’s total refractive power. It also plays …
Sclera is the white outermost layer of the eye. It is a tough, fibrous membrane composed of collagen and elastic fibres. It serves as a protective covering for the other layers of the eye and helps to maintain the shape of the eyeball. It also helps the eyes to move smoothly in their sockets. The …
How are the eyes protected? Eye socket: Depressions in the skull External eye muscles: Fix the eyeballs in the orbit. Eyebrow: The eyebrows act as a shield to keep dirt, sweat, and other debris from entering the eyes. They also help keep the eyelashes from rubbing against the eyes. Eyebrows also provide a physical barrier …
The eye is an organ that detects light and converts it into electro-chemical impulses in neurons. The eyes enable us to see and help us to interpret the world around us. The eye has a number of components which include the cornea, iris, pupil, lens, retina, choroid, and optic nerve. The cornea is a transparent …
Cause Epilepsy is caused by abnormal electrical activity in the brain. This can be caused by a variety of things, such as genetic factors, head injuries, stroke, infections, or even stress. This irregular flow of electrons can cause a seizure, which is a sudden burst of involuntary muscle contractions. Symptoms Convulsions, muscle spasms, loss of …
Cause Parkinson’s disease is a neurological disorder caused by the degeneration of nerve cells in the brain that produce dopamine. The exact cause of Parkinson’s disease is unknown, but researchers believe that environmental and genetic factors may play a role in its development. It is believed that exposure to certain toxins, such as pesticides, may …