Me too. It is really bad. Myopia is no issue when I work at the computer, since I can move closer, but with astigmatism I cannot read at all without glasses. It has recently increased to 3.5 diopter cylinder according to the measurement device. At those values it is even difficult to buy glasses.

>Anyone know what can cause sudden onset of astigmatism in adulthood? It appeared a couple years ago and seems stable. Not sure over what period it appeared, probably in 3-12 months.

If it was unstable, it could be keratokonus

I always thought it was genetics or perhaps excessive screen time is my next guess but I've been told its not possible.

Screen time leads to less blinking and drier eyes

Perhaps that causes astigmatism? Perhaps the cornea needs blinking to stay stable?