Everyone knows that there is "blood pressure".
But few people know about "intraocular pressure".
High blood pressure is troublesome.
In fact, high intraocular pressure can also cause problems.
Especially when it's cold.
Due to the large variation of the temperature difference.
Intraocular pressure may fluctuate greatly.
This in turn causes an acute attack of glaucoma!
Why does intraocular pressure increase when it is cold?
Let's start with what intraocular pressure is!
What is intraocular pressure?
Intraocular pressure is the pressure inside the eyeball, which is simply called intraocular pressure. It is the equalized pressure exerted by the contents of the eye on the wall of the eyeball, just as the pressure in the blood vessels is called blood pressure.
Normal vision depends on the maintenance of normal intraocular pressure, which is a normal range of intraocular pressure to maintain the stability of the eyeball.
In a normal person, the intraocular pressure is 10 mmHg 21 mmHg, the intraocular pressure of 24 mmHg is high, and the intraocular pressure of 8 mmHg is low.
In general, high or low intraocular pressure can damage vision to varying degrees, especially high intraocular pressure.
What are the dangers of high intraocular pressure?
Increased risk of developing "glaucoma": increased intraocular pressure is likely to damage the optic nerve, and in severe cases, glaucoma and blindness.
Headache and eye swelling: Patients often experience migraine and eye pain due to the rapid increase in intraocular pressure and irritation of the trigeminal nerve endings.
Nausea and vomiting: elevated intraocular pressure can reflexively cause the vagus nerve and vomiting nerve center to excite, resulting in nausea and vomiting.
Rainbow vision: Due to the increase in intraocular pressure, the phenomenon of colored rings will occur when looking at lights.
Why does intraocular pressure increase when it's cold?
1. Because of the drop in temperature, the cold will seriously stimulate the sympathetic nervous system and excite, so that the pupils will be dilated, resulting in narrow angles and blocked aqueous humor outflow, causing aqueous humor overflow and high intraocular pressure
2. The air is relatively dry in winter, and some people will drink a lot of water, which will significantly increase the aqueous humor, resulting in increased intraocular pressure, which will lead to a sudden attack of glaucoma.
In addition, these conditions can also lead to an increase in intraocular pressure on a daily basis:
Staying in the dark for too long, bowing your head and reading for too long;
Poor rest, overwork;
Normal people may increase their intraocular pressure by 6 mmHg when they change from a sitting position to a lying position, and if they adopt an inverted position, their intraocular pressure may rise by more than 10 mmHg
Overeating, drinking large amounts of fluids (such as 500cc) in a short period of time can increase intraocular pressure;
Some medications can also cause an increase in intraocular pressure***, especially those containing steroids.
So how to prevent high intraocular pressure?
When it's cold, keep your eyes warm, and stand in the corridor for a while after going out to let your eyes get used to the temperature before walking.
For some people with unstable intraocular pressure, exertion, or lack of sleep, it's best to have their intraocular pressure checked every two weeks and the fundus once a month. If the elderly have eye swelling and pain in winter, and sometimes colored circles appear when looking at the light bulb, they should go to the hospital in time.
It is not recommended to use a mobile phone when riding or walking. When using a mobile phone on the go, you need to constantly adjust the ciliary muscles of the eyes to align the focal length, which can easily cause eye fatigue.
Playing with your phone in the dark is incredibly harmful. Using your eyes in dim light will cause your pupils to dilate for a long time and block the circulation of fluid in your eyes, so try not to look at your phone in the dark at night.
Have a regular life, eat less stimulating food, and don't drink a lot of strong tea or coffee.
Produced by the first team of the Second People's Hospital of Foshan City.