Which is bad for your eyes?

The eyes are exposed organs and not protected by anything, so they are easily affected by external factors.
 
Eyes’ healthy life expectancy is about 70 years which are shorter than our life expectancy.
 
Q1. Which is not good for eyes when your eyes feel tired?
(A) Exercise to move your eyes up and down and sideways
(B) Massage between the eyes
 
A1. (A) Exercise to move your eyes up and down and sideways
There is no benefit to move your eyes voluntary because eyes are moving involuntary anyway. There are a lot of people who had retinal detachment caused by the exercise.
 
Massaging between the eyes is good when your eyes are tired, but massage the bones around the eyes and don’t massage the eye ball because massage eye ball can also cause retinal detachment if it is repeated many times.
 
Rubbing the eye balls because of the itchiness caused by seasonal allergies can cause retinal detachment as well.
 
Cataract
 
If you can’t see blue color very well, it can be considered as the early stage of cataract. People with cataract have to see things through yellow filter which makes difficult to see blue color.
 
Q2. One of the causes of cataract is UV. Which sunglasses shouldn’t you wear to prevent cataract?
(A) Sunglasses with dark colors
(B) Sunglasses with pale colors
 
A2. (A) Sunglasses with dark colors
The pupil becomes larger and smaller to adjust the amount of the light going into the eye. When it is bright around, the eye decreases the amount of light by contracting the pupil. When it is dark around, the eye increases the amount of light by dilating the pupil.
 
When you wear sunglasses with dark colors, the eye tries to get more light by dilating the pupil. At that time, even if you are wearing sunglasses, reflected light goes into your eyes with dilated pupils from gaps around sunglasses and the eyes are affected by harmful UV. That is why sunglasses with dark colors are not good for your eyes.
 
Glaucoma
 
Glaucoma is a leading cause of blindness.
Even if vision of one eye becomes narrow, if another eye is normal, the brain synthesizes the vision, so it is difficult to notice by oneself until it becomes severe.
 
Q3. Which should not you do because the risk of glaucoma becomes higher?
(A) Drinking a lot of water after exercises
(B) 30 minutes walking every morning
 
A3. (A) Drinking a lot of water after exercises
Drinking a lot of water increases water in the body and also increases water in the eye suddenly. Increase of water in the eye pressurizes the inside of the eye and compresses and damages the optic nerve, narrowing the vision.
 
The amount of water depends on people’s condition, but it is not good to drink water rapidly.