The standard for pupil dilation is

We are all familiar with eyes, and we all say that eyes are the windows to the soul. Having a pair of bright eyes is the dream of all of us. For this dream, we must protect our eyes well so that we can see this colorful world of flowers and plants of all shapes and sizes. Moreover, the pupils can also reflect our physical condition to a certain extent. For example, dilated pupils. It also marks certain parts of our body. Organs are symptom-prone, so when this happens, we must seek medical attention in a timely manner to avoid delaying the disease, which will cause further deterioration and reach a point where it cannot be cured. So let’s take a look at some of the standards for pupil dilation!

1. Causes

The pupil not only responds to light and darkness and adjusts the light entering the eye, but also affects the depth of focus and spherical aberration of the eye's optical system. The range of pupil changes can be very large. When extremely contracted, the diameter of the human pupil can be less than 1mm, and when extremely dilated, it can be greater than 9mm. The iris sphincter can shrink to 87% of its length, which is almost impossible for other smooth muscles or striated muscles in the human body to achieve. The pupil will adjust its size according to the intensity of external light. When the light is strong, the pupil becomes smaller, and when the light is weak, the pupil becomes larger. This is a self-protection for the eyes.

2. Related knowledge

Doctors also consider the pupil to be a sensitive indicator of vital functions. As we all know, the pupil will automatically shrink when the light is strong, and dilate when the light is dim - this is called the pupil's response to light. If the pupil's response to light becomes slow or absent, it means death is imminent. For comatose patients, their pupils will gradually dilate as their loss of consciousness worsens. Complete dilation is a sign of the end of life.

When a man meets a woman he likes, his pupils will dilate. Conversely, when he meets a woman he hates, his pupils will shrink. This is the charm of the first impression of "beauty is in the eyes of the beholder" that is engraved in the heart.

Delicious food presented in front of people will also make people's pupils dilate, and they will become larger for hungry people; when people listen to beautiful music or taste delicious drinks with their tongues, their pupils will also dilate. In addition, the pupils will dilate when you are in a state of fear, tension, anger, love, pain, etc.; and they will shrink when you are disgusted, tired, or annoyed.

What’s even more interesting is that changes in pupil size reflect certain psychological activities. Whenever there is a strong interest or motivation, the pupil will expand rapidly. Ancient Persian jewelers charged prices for jewelry based on the size of the customer's pupils. If the sparkle of a diamond ring can make the buyer's pupils dilate, the dealer will charge a higher price.