What is the normal difference in intraocular pressure between the left and right eyes?
May 16, 2023
Source: Cainiu Health
Dr. Cui Xin
Introduction
The intraocular pressure (IOP) between the left and right eyes typically does not differ by more than 5 mmHg, which is considered normal. Generally, a normal IOP range is 10 mmHg to 21 mmHg, with a difference of no more than 5 mmHg between the two eyes and fluctuations of no more than 8 mmHg between day and night. Intraocular pressure refers to the force exerted by the contents of the eye on the eyeball wall; under normal conditions, it helps maintain the stable structure of the eye and provides good refractive status.
Under normal circumstances, it is considered normal for the intraocular pressure (IOP) between the left and right eyes to differ by no more than 5 mmHg. Specifically: The normal range for intraocular pressure is generally between 10 mmHg and 21 mmHg. A difference of no more than 5 mmHg between the two eyes, and fluctuations of no more than 8 mmHg within a 24-hour period, are considered within the normal range. Intraocular pressure refers to the force exerted by the contents of the eye on the eyeball wall. Under normal conditions, it helps maintain the stable structure of the eye, provides good refractive status, and supports proper eye function under appropriate metabolic conditions. However, IOP is not a fixed value; like blood glucose and blood pressure, it naturally varies with physiological changes in the body. Therefore, a single measurement does not necessarily indicate abnormal pressure. It is necessary to measure IOP at each clinic visit to obtain a more accurate assessment of one's ocular health. Elevated IOP is commonly seen in glaucoma patients; if pressure remains high over a prolonged period, it may lead to optic nerve damage. It is recommended that patients protect their eyes in daily life and avoid prolonged exposure to sunlight to prevent worsening of their condition.
