Why did my eyes suddenly become blind and everything became pitch black?

Eyes are one of a person's five senses, and they have many functions. They are not only the generator of vision, but also a component of shape. People often say that when looking at a person, you have to look at the eyes first, which means that the eyes can have a greater impact on the image. The eyes are also prone to disease problems. For example, some people suddenly become blind and everything goes dark. Why is this happening? Let’s take a look at the relevant explanations below.

It usually happens when you are lifting heavy objects, straining to defecate, etc., and you will find that your eyes are dark, and you still can't see after a long time. I have seen reports before that someone’s vision suddenly deteriorated sharply when doing a handstand while exercising. When he went to the hospital, it was found that he had a large retinal hemorrhage in front of the macula.

Because when you stand upside down, more blood will flow to the brain, increasing the blood supply to the brain, and correspondingly more blood will fill the blood vessels in the eyes. If some blood vessels are relatively fragile, they may rupture and cause bleeding.

Activities like lifting heavy objects and straining during bowel movements can cause a rapid increase in intrathoracic and intra-abdominal pressures, which in turn increases central venous pressure, affecting venous return to the heart, causing an instantaneous increase in blood pressure. It can cause head-related symptoms such as conjunctival congestion, skin petechiae and traumatic asphyxia. This type of movement is called the Valsalva maneuver.

Due to the sudden increase in venous pressure, it may cause bleeding in some small blood vessels. If the superficial capillaries in the macular area bleed, causing a large area of ​​blood to cover the macular area, it will cause a rapid deterioration in vision. However, this kind of bleeding will generally be absorbed, and after diagnosis and treatment by a doctor, most vision can be slowly restored.

In addition to lifting heavy objects, straining during bowel movements, and doing handstands, similar actions, such as weightlifting, violent coughing, singing, and laughing, may also cause retinal hemorrhage. You should be careful to do things within your ability.

When everything suddenly goes dark in front of our eyes, we still need to be fully alert and find out what the problem is. If the problem is serious, we need to seek medical attention in time.