Why does my cat have these white lenses across his eyes?

My cat is a male boy and I just noticed today when he came back into my house after been let out all day whilst I was at work, that he had these white lenses covering his eyes. They are much worse than they are in this picture, it's just he wouldn't hold still haha. I thought it may be because he is tired so I left them until he went to sleep, and so he did and I noticed afterwards that they are still there. Can anybody help me or give me some advice? Btw I am a student so I cannot afford some ridiculously high medicine for him


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