the human eye

noun. the specialized sense organ, capable of receiving visual images, which are then carried to the brain

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eyelashes

noun. each of the short curved hairs growing on the edges of the eyelids, serving to protect the eyes from dust particles

Without proper cleaning of your eyelashes, it may lead to various ocular surface diseases like: 

Demodex   ●   Blepharitis   ●   Biofilm

Image by Linh Ha

eyelids

noun. each of the upper and lower folds of skin which cover the eye when closed

Your eyelids are responsible for protecting their surface from foreign elements and blinking to prevent our eyes from drying out. Without proper function, your eyelids may have inflammatory disorders including:

puncta

noun. the eye's tear ducts or the tiny openings that drain tears from your eyes

A common condition when your puncta is not draining your tears properly include:

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cornea

noun. the clear front surface of the eye. It lies directly in front of the iris and pupil, and it allows light to enter the eye.

The cornea provides most of your eye's optical power. Some diseases associated with an improper functioning cornea include: 

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Cataract

lens

noun. transparent, biconvex tissue that helps bring rays of light to focus on the retina

The lens allows your eye to focus on objects at varying distances. ​The most common disease associated with clouding or the opacity of the lens is known as: 

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conjunctiva

noun. the clear, thin membrane that covers part of the front surface of the eye and the inner surface of the eyelids

Disorders in the conjunctiva may lead to:

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vitreous

noun. the jelly-like substance that fills the middle of the eye. Also called the vitreous humor.

The vitreous is like a clear gel that fills the body of our eyes. It's full of tiny fibers that attach to your retina (back of your eye) which keeps the retina properly attached connected to the back wall of your eye. Some disorders in the vitreous may include:

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retina

noun. located at the back of the eye, the retina is a layer of tissue that transforms the light coming into your eye into electrical signals

The electrical signals are then sent to the brain where they are recognized as images. Therefore, if your retina is not performing well you may not see well either. Some common disorders within the retina include: 

optic nerve

noun. a nerve at the back of your eye that connects to your brain. The optic nerve sends light signals to your brain so you can see.

The most common eye disease associated with the optic nerve is known as: