Question

Your friend has weak eyesight he is unable to see the writing on the board but refuse to wear his glasses as a result he isn't able to do well in his last assignments.. Solution

Answer 1

I would take out some examples of famous personalities who wore glasses and later succeeded in life. For example, Stephen Hawking. Then I would tell that these days wearing spectacles has become a new fashion.

P.S. If your friend is a fashion-lover, you can add this.

If you wear glasses you would do your things much better than before. It doesn't matter if you sit continuously for three hours in front of the laptop or computer after wearing glasses.

In these ways you can convince and encourage your friend.

Hope this helps:)