a nice quick video tutorial on the slit lamp exam from this old ALiEM post:
if you only have a couple minutes, the ~2:00 to 4:00 minute mark are nice reminders of a few knobs and how to adjust the level and light window.
also, there’s a nice example of cell & flare at the ~5:30 mark.
Go forth, look at eyeballs.
References: ALiEM post (with other eye exam videos also)