Vision problems at work

Rob: I`m so nearsighted I nearly worked myself to death.

Sam: What`s being nearsighted got to do with working yourself to death?

Rob: I couldn`t tell whether the boss was watching me or not, so I had to work all the time.

to be nearsighted - бути короткозорим

to work to death - запрацюватися до смерті, дуже багато і важко працювати