I've noticed my vision can be slightly worse just after waking up, or on a rainy day. Any science to this?
Changes in length of the eye, and the strength of glasses you need, does change slightly over the course of the day.
"During at least 1 day, 15 subjects showed a statistically significant (ANOVA, P < 0.05) diurnal fluctuation of axial length, with a magnitude generally between 15 and 40 μm."
Atmospheric pressure, not so much.
"No, eye pressure is not significantly influenced by changes in barometric pressure."
It took a massive two atmospheres of pressure to make a measurable change in strength of glasses required, in people placed in a hyperbaric chamber.
"The mean IOP decreased significantly from 11.8 mm Hg in the right eye (RE) and 11.7 mm Hg in the left eye (LE) at 1 Bar to 10.7 mm Hg (RE) and 10.3 mm Hg (LE) at 2 Bar (P = 0.024, RE; P= 0.0006, LE)."
Likewise, the massive pressures working underground or in an underwater air bubble used to construct bridge foundations (a caisson) can cause a myopic shift (change in strength of glasses needed.)
High atmospheric pressure and myopic shift in caisson workers.
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