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The Pharmacist Answers Podcast

Have a question for the pharmacist? Get your answers here! Clear explanations about complicated medical topics that anyone can understand. Disclaimer: The information contained in this blog and related podcast are not to be taken as medical advice, they are for informational and educational purposes only. If you resemble anything that is mentioned in this blog or related podcast, contact your doctor. The information contained in this blog and related podcasts is the opinion of the author and does not relfect the views of her employer, Walgreens. If you want to know what Walgreens thinks, ask Walgreens!
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Feb 27, 2017

Your eyes are more complex than any camera on the planet!

Cornea - a concave lens on the front of your eye that focuses light
Iris - the colored part, a diaphragm that controls how much light comes in (the pupil is the hole the light enters = equivalent to the aperture of a camera)
Lens - the "focuser", uses a process called accommodation to focus near to far and make the image as sharp and clear as possible
Retina - the sensor, and sends signals to the brain to translate light into an images

The retina has 2 types of sensors:
- Rods - detect light intensity
- Cones - color differentiation

Two special areas of the retina:
- Macula - right in the middle of the retina, they place that detects the most detail (that's why the center of your vision field is a clearer picture than the periphery)
- Fovea - the center of the macula, it contains cones (color sensors) only to aid in the translation of very fine details

Support structures
- Extra-ocular muscles - allows your eyes to move around in their holes
- there are chambers of fluid that are between each structure of the eye, and that fluid helps hold nutrients that feed those parts, and remove waste
- Choroid - the layer that holds all the blood vessels that feed the eyes
- Sclera - the whites of your eyes, an outer coating that hold everything inside
- Conjuntiva - the mucus membrane that attaches the sclera to the eyelids; produces liquid for lubrication and trapping invaders

PSA: Please don't vigorously rub or scratch your eyes, you could hurt them!   

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"Radio Martini" Kevin MacLeod (incompetech.com)  Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

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