Is there any way to naturally decrease intraocular pressure?

No: Relaxation and rest are always helpful but there are no reliable methods to lower eye pressure naturally.

Sort of: Eye pressure can be temporarily reduced by strenuous exercise.

Aerobic exercise: Regular aerobic exercise has been shown to lower iop in previously sedentary patients. There may be some help to the cardiovascular system, so that exercise has neuroprotective effects on the optic nerve. The mechanism may have something to do with hypertension and blood pressure, as an indirect effect.

Agree : The one thing worth mentioning is that the effect of exercise is typically transient - to enjoy the lowering iop effect, the exercise must be done on a regular basis. All types of exercise (aerobic, isometric, etc) seem to have some benefit.