Refractors are the heart of a typical Ophthalmic Examing lane. There are many different models from a variety of manufacturers. For the most part these instruments hold their value incredibly well and even very involved repairs rarely approach 1/2 of their replacement value.
Unless your instrument has been run over by a truck we recommend that you consider repairing it. Tek-Net is always happy to provide a free loaner (you just pay the shipping) & free repair estimate for your approval.