Hey Golgi,
Hang in there! My program is definately similar to yours; we used to joke last year Wills Eye Manual was our attending, we even tried giving "him" a teaching award

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Keep in mind that all the upper level residents went through this, survived and went on to become competent ophthalmologists. Take a deep breath, use your back-up for questions, read as much as you can. If you are not sure about a decision made overnight, make arrangements for close follow up. Utilize other subspecialities on-call: last year when I had a retina questions, I'd call the retina fellow on-call directily, sometimes bypassing my back-up (I agree, not the best thing). And, again, eat well, spend time with family, try to excersise (easier said then done). Before you know it, you'll be the one people call for advice

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I hope this helps!