Case: Reduced vision

Read the following description and then answer 6 questions about this optometry case. You'll receive the answers and explanations after you've responded to all the questions. Good luck! 

A 70-year-old Caucasian male, a myopic contact lens wearer, comes for a routine follow up in the practice. He has had reduced vision OD for a year and have been to ophthalmologists that are following him. He does not have any other disturbing visual symptoms. His refraction is:
OD -3.00 -0.50x90 VA 0.5 (6/12) OS -2.50 -0.75x50 VA 1.2. (6/5)