If you wear glasses and also need to wear safety glasses at work, for activities such as drilling, sawing, grinding or hammering you will know how awkward it is trying to wear regular safety glasses with your usual glasses.
There is an answer to this problem. Use a prescription safety glasses. You can choose from a selection of styles at spex4less. All conform to British Standards and all have safety side shields. Check out the Safety Glasses section of this site, or head straight to the Safety glasses (click on the General Glasses tab) section of the spex4less website.