Thanks for your query at DoctorSpring.com
I understand your concern
Once organ donation occurs especially in an eye (corneal transplant) the rejection chances are there till 3-5 years. First of all you should be thankful to god no rejection has occurred. Now your query about transfer factor, I will not recommend you for any such medication because how it reacts to your body is a difficult question to answer so it is better to avoid such medication
I hope it was helpful, feel free to discuss further.