Bring Renesco some glasses
The radscorpion in Broken Hills
You need to steal the spectacles from the Professor's radscorpion (or kill it) in Broken Hills and bring them to Renesco in New Reno. You'll have the opportunity to ask him for money, a discount on his wares, or to just let him keep them, then possibly get the Pip-Boy medical enhancer. The only way to get the enhancer is to tell Renesco how are his glasses about 20 times.