“Intraocular pressure” refers to the pressure inside the eyeball.
The eyeball contains a fluid called aqueous humor, which provides nutrients to tissues such as the cornea and lens, which have no blood vessels and cannot receive nutrients from blood.
As aqueous humor flows inside the eyeball, intraocular pressure is kept constant, allowing the eyeball to maintain its round shape.

If intraocular pressure is low, the shape of the eyeball cannot be maintained, and if it is high, the optic nerve is compressed and gradually damaged, which can lead to glaucoma.
We recommend having your intraocular pressure checked regularly to make sure it is kept within the normal range.

Normal intraocular pressure is said to be between 10 and 21 mmHg, However, the intraocular pressure level that each person can tolerate is different.
Intraocular pressure has the characteristic of easily fluctuating throughout the day. Even if it is outside the normal range, it may be diagnosed as no problem by retesting on a different day or at a different time of day.
Intraocular pressure can also fluctuate depending on the season. In general, it tends to be lower in summer and higher in winter.

If intraocular pressure is higher than normal, you may be at risk for glaucoma.
Glaucoma is a disease in which the optic nerve is damaged, resulting in impaired vision. However, glaucoma can also occur even when intraocular pressure is within the normal range (normal tension glaucoma), and glaucoma can be discovered during a fundus examination.

Obesity and high blood pressure also affect high intraocular pressure. Therefore, preventing lifestyle-related diseases also helps with eye health. If you are obese or have high blood pressure, we recommend that you try to lose weight first.

If you are told that you have high intraocular pressure, you should first visit an ophthalmologist, undergo an examination and diagnosis, and receive treatment for glaucoma if necessary.