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Structure of Eye

The average size of a human eye is 1 inch, roughly 2/3 the size of a ping pong ball, and weighs approximately 1/4 of an ounce, sits in a little hollow area (the eye socket) in the skull. Size in adults varies little and is relatively uniform with an allowance for 2 to 3 millimeters.

In infancy, the human eye is approximately 18 millimeters and grows gradually until adulthood. The bony socket around the eye continues to grow as well. The human eye contains approximately 130 eye anatomymillion pixels in that space though only 6 million see in color while the rest see only in black and white. It sees 270 degrees in all if not accounting for head movement and only including peripheral vision.

The eyelid protects the front part of the eye. The lid helps keep the eye clean and moist by opening and shutting several times a minute called blinking, and it’s both a voluntary and involuntary action, meaning you can blink whenever you want to, but it also happens without you even thinking about it.

The eyelid also has great reflexes, which are automatic body responses, which protect the eye. When you step into bright light, for example, the eyelids squeeze together tightly to protect your eyes until they can adjust to the light. And if you flutter your fingers close (but not too close!) to your friend’s eyes, you’ll be sure to see your friend’s eyes blink. Your friend’s eyelids shut automatically to protect the eye from possible danger. And speaking of fluttering, don’t forget eyelashes. They work with the eyelids to keep dirt and other unwanted stuff out of your eyes.

Parts of eye and their function

 

 

 

How to keep your Eyes Healthy

Get Regular Eye Exams 

Foods to improve Your Eye Health

Have a Comprehensive Dilated Eye Exam

Eye safety tips from computer screen

Common Vision Problems

 Age-related Eye Diseases

 

 

 

 

Related Topics

How to choose sunglasses

Kinds of Contact Lenses

Some interesting Eye Facts


 

Reference

http://www.webmd.com/eye-health/features/tips-for-healthy-eyes#3

https://nei.nih.gov/healthyeyes/eyehealthtips

http://kidshealth.org/en/kids/eyes.html#

http://www.allaboutvision.com/nutrition/foods.htm

http://www.bausch.com/vision-and-age/20s-and-30s-eyes/healthy-eyes

http://www.healthline.com/human-body-maps/optic-nerve

https://en.wikipedia.org/wiki/Human_eye

http://www.medicinenet.com/script/main/art.asp?articlekey=10609

http://www.aao.org/eye-health/tips-prevention/top-sunglasses-tips

http://www.aoa.org/patients-and-public/caring-for-your-vision/contact-lenses/advantages-and-disadvantages-of-various-types-of-contact-lenses?sso=y

http://www.everydayhealth.com/vision-center/lenses-and-beyond/contact-lens-options.aspx

https://www.reference.com/science/big-human-eye-59a54b764d3ea21e#

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