that's how i felt my first week of a four week elective in ophthalmology. i felt soooo useless...had headaches every day and felt very invisible.
but then i asked to learn how to do more, and maybe they will let you too. by the second week, i was taking histories, checking vision, and fumbling with the slit lamp. by the third week, i was also getting tonometry (using the tonopen), and getting better at the slit lamp. by the last week, i was adding applanation to my skill set, getting pachymetry's on glaucoma patients, was able to do almost the entire neuro-ophtho exam, and feeling pretty confident at using the slit lamp (at least to look at the anterior chamber. using the little lens to look at the back of the eye just made my head spin).
granted i was far from perfect at any of these skills and worked much slower than the residents, who obviously had a lot more experience doing all this. but hey! at least i was able to stay busy and be involved. tell them you want to learn how to do a good eye exam, and maybe they will help you out!