I did a one month elective in ophthalmology at Moorfields Eye Hospital this last August. I am a last year med student from Alexandria (Egypt). Moorfields does accept students from all over the planet. There was an Indian student and a Spanish student while I was there. Before I have gone to Moorfields, I had contacted a consultant ophthalmologist in medical retina and arranged to participate in one of his ongoing research projects. It was amazing.
They also have (observerships) for those who have already qualified. Anyway, during your elective as a student, you are practically just (observing). You may examine patients with slit lamps and ophthalmoscopes but u r never allowed to scrub or assist in surgery. The main difference between the student elective and the observership for doctors is that u get to rotate in all the services in the hospital as an elective student, while u can only (observe) in one service (eg neuro-ophthalmology or medical retina...etc) as an observer (if u have already qualified as a doctor). Another difference is the fees u pay: as an elective student u pay only 25 pounds per week (100 pounds/4 week elective), while as an observer u pay more (I think 200 or 250 pounds, not sure).
Typically, some consultants are more student/observer friendly than others. It is very helpful if u have a strong background in ophthalmology, as this elective is on a resident-level, as Moorfields is a tertiary referral center (The first case I saw on my first day was Fuchs heterochromic iridocyclitis with secondary glaucoma). There's no formal teaching for students/observers, but u r allowed to attend all the seminars and meetings taking place. U r totally self-paced while there, as in all UK hospitals. You don't HAVE TO attend unless u want to do so, as u not given any responsibilities.
The hospital has a partnership with the near-by institute of ophthalmology, which is concerened with ophthalmic research. This is where the library is located, where u can log on the internet and gain access to all the ophthalmic texts, journals or periodicals u might think of.
The one who is responsible for arranging electives is Miss Jennifer Irish She is a very friendly person, but she is overworked, so be patient.
I'd be happy to answer any question.