Is it permissible to use the amount allocated for prescription eyeglasses (600 Egyptian pounds) to get two pairs of glasses, one prescription and one sunglasses, knowing that I will not exceed the allocated amount?

The mentioned amount has two scenarios: Either it is a grant from the company to the employee under the name of "glasses allowance," in which case the employee has the option to spend it [as they wish]. Or it is a grant for the purchase of glasses, in which case the employee must return any surplus, if found, to the concerned party, unless that party agrees to him keeping it. If the questioner does not know the company's intention, he must ask them.