The eye is made up of three coats, or layers, enclosing various anatomical structures. The outermost layer, known as the fibrous tunic, is composed of the cornea and sclera, which provide shape to the eye and support the deeper structures. The middle layer, known as the vascular tunic or uvea, consists of the choroid, ciliary body, pigmented epithelium and iris. The innermost is the retina, which gets its oxygenation from the blood vessels of the choroid (posteriorly) as well as the retinal vessels (anteriorly). Eye misalignment (strabismus), including inward ( esotropia), outward ( exotropia), upward ( hypertropia) or downward (hypotropia). In addition, other measures are proper lid hygiene, avoidance of eye rubbing, [72] and proper use of personal products and medication. Eye make-up should be used with care. [73] Disease [ edit ] Diagram of a human eye ( horizontal section of the right eye) Kjaergaard, SK (2001). Indoor air quality handbook: Chapter 17, the Irritated Eye in the Indoor Environment. New York: McGraw-Hill. ISBN 978-0-07-445549-4.

Thomson, W. David (March 1998). "Eye problems and visual display terminals—the facts and the fallacies". Ophthalmic & Physiological Optics. 18 (2): 111–119. doi: 10.1046/j.1475-1313.1998.00323.x. PMID 9692030. S2CID 222083261. Your eyes are one of your brain’s windows to the world. They gather light from your surroundings and help your brain build the picture you see. It’s easy to take this sense for granted when it works properly and easy to miss when it doesn’t. You can do several things to help protect and maintain your eyes, many of which involve simple steps you can take every day.It’s also important to remember that many causes of eye symptoms — especially sight/vision changes or eye movement control symptoms — may not be due to an eye condition. Some might happen due to a condition elsewhere in your body. An example of this is yellowing of the sclera when you have jaundice. The cornea (say: KOR-nee-uh), a transparent dome, sits in front of the colored part of the eye. The cornea helps the eye focus as light makes its way through. It is a very important part of the eye, but you can hardly see it because it's made of clear tissue. Like clear glass, the cornea gives your eye a clear window to view the world through. What's the Iris? The distance between the VDU and keyboard should be kept as short as possible to minimize evaporation from the ocular surface area by a low direction of the gaze, [70] and

Barber, Laurie Gray; Gudgel, Dan T. (March 2, 2018). "How Sexual Activity Can Affect Your Vision". American Academy of Ophthalmology . Retrieved November 28, 2020. a b Mendell, Mark J. (22 April 2004). "Non-Specific Symptoms In Office Workers: A Review And Summary Of The Epidemiologic Literature". Indoor Air. 3 (4): 227–236. doi: 10.1111/j.1600-0668.1993.00003.x.

How vision works

Some symptoms affect the surface of your eye only. Others affect the inside of your eye. Some key types of eye symptoms include: Cunningham, Emmett T.; Riordan-Eva, Paul (2011-05-17). Vaughan & Asbury's General Ophthalmology (18thed.). New York: McGraw-Hill Medical. ISBN 978-0-07-163420-5. Human eyes are complex, and it takes many parts working together correctly for you to see. Eye anatomy