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Talking glaucoma 19on. This might be because you lie down at night and are upright and active in the day.Time of year also affects eye pressure. Eye pressure tends to be higher in winter than summer. The bigger the change in weather between summer and winter, the bigger the change in eye pressure.Eye doctors don%u2019t fully understand why eye pressure varies by season, though some research suggests that heat and sunlight exposure may influence hormones and blood flow, affecting eye pressure.Seasonal fluctuations in eye pressure can differ from one person to another. For example, the change may be less for people with normal tension glaucoma than for people with other kinds of primary open angle glaucoma. The difference may be greater for people using beta blocker eye drops such as timolol than for people using other kinds of eye drops. And it may be greater for people with dry eye disease. More research is needed to confirm and understand this.How much do these ups and downs in eye pressure matter? Our eyes are fine with changes in eye pressure within a limited range. But that range may be different for everyone. If your optic nerve is susceptible to damage, the range it can cope with may be smaller.Short-term changes in eye pressure are less likely than long-term changes to cause damage. Most people don%u2019t need to avoid activities that raise eye pressure for a short time. But you should check with your eyecare professional, especially if you do this kind of activity a lot.Most people don%u2019t need to worry about changes in eye pressure in the day or between seasons. In fact, some research suggests that summer%u2019s reduction in eye pressure helps protect your optic nerve. Long, hot, sunny summers may be good for your glaucoma.Eye pressure tests tell you what your eye pressure is at one moment in time. Lots of things can affect the result: time of year, time of day, how you travelled to your appointment and so on.That%u2019s why eyecare professionals might not worry too much about a one-off low or high eye pressure test result. If they%u2019re unsure, they might repeat the test after you%u2019ve sat quietly for a few minutes. They might arrange an early follow-up appointment to check on it. Combining eye pressure test results with other measures such as visual field helps them to judge how much a change in eye pressure matters. They%u2019re most likely to be concerned if your eye pressure goes up and stays up across two or more appointments.Eye pressure is important, but measuring it only gives a snapshot. It%u2019s good to be a little skeptical and think about the wider context.%u201cMost people don%u2019t need to worryabout changes in eye pressure in the day or between seasons