I am re-applying to OD school for the second time. I had awesome letters of recommendations from ODs that I currently work for. While applying again, do I need to ask new people for letters or can I re-use the ones from last year? If I can recycle the letters from last year, how do I go about asking those ODs for their letter again. Some of them I was never able to see/read because they had to submit to the OptomCAS.