Is having a cataract surgery effective for high myopia and astigmatism?

It can be: Cataract surgery can be very effective these days for both. Very accurate measurements of the eye are obtained preoperatively, and a computer program tells us what power of implant to use to make the eye see as well as it can uncorrected! this works beautifully for high myopia.......Astigmatism can now be treated at the same time with the use of toric implants.

Yes: You should be able to eliminate most if not all of your near sightedness and astigmatism with cataract surgery. There is some risk of retinal issues so you will need continued followup postop.

It may be: Although the main reason for cataract surgery is to remove the cloudy lens, modern techniques - including toric implants, multifocal implants, and laser cataract surgery - can drastically reduce or even eliminate both astigmatism and myopia.