If you haven’t played snooker in glasses before, then there are some points to consider.
Wearing snooker glasses will improve the quality of your vision, the balls will be sharper and clearer and it will be easier to sight the edges of the balls at distance. If you are used to wearing glasses all the time then you will already be accustomed to the differences a corrective lens will make to your vision.
The type of prescription you have will change your spacial awareness on the table.
If you are long sighted (hypermetropic), ie your prescription is prefixed with a ‘+’ then the lenses in your snooker glasses will as a general rule magnify the image you perceive, giving the impression that you are slightly closer to the balls than you are accustomed.
If you are short sighted (myopic) and your prescription is prefixed with a ‘-‘, the lenses in your spectacles will reduce the size of the image you perceive giving the impression that you are slightly further from the balls than you are used to.
When wearing glasses for snooker for the first time it can take a while to fully adjust to these effects, luckily the human brain is a very powerful thing and also very adaptable. Whereas some people adjust to these differences instantly, other can take a few weeks depending upon how frequently they play. I have yet to meet anyone who, given sufficient table time is unable to adapt.