When clay shooting, it is always advisable to wear glasses to protect your eyes from clay fragments. They are also handy for improving visibility in different outdoor conditions. A variety of coloured lenses are used to help different coloured clays show up better under specific lighting or background conditions. I use Pilla or Beretta shooting glasses and generally use a 22N lens now that the weather is nice and light.

The Beretta Race Glasses are a particular favourite of mine.
They offer an all-round lens that shows up orange clays very well against a background, and vision for black clays is not compromised. They have a relatively wide lens that prevents light from flooding in. Safety should never be a compromise. Riley safety glasses provide a cost-effective solution with impact-resistant lenses that meet professional standards.
During the winter, when the lighting is poor and rather dull, I mostly use a clear lens with a slight green tint, allowing most light to enter my eyes.
There are many different brands and models of shooting glasses, some much better than others, mainly based on lens clarity. You can tell the difference between cheap and expensive shooting glasses relatively easily. Cheap shooting glasses can perform a basic job and are often a popular choice for people who are not keen to invest a lot of time or money in shooting. However, regular shooters, particularly those who compete, find that high-quality shooting glasses are a great investment, as the difference in protection and performance is vast.