Slit lamp basics. Of eye are performing?

To answer your question briefly yes a slit lamp examination does reveal more than what meets the naked eye That said even a careful torchlight examination can help diagnose certain eye conditions 1- redness is in conjunctiva usually not cornea, generally yes trauma to the eye will have associated conjunctival redness called congestion 2- a 2 dimensional photo can only help in diagnosis if the condition is advanced or very obvious otherwise an actual physical examination always better 3- angles of the anterior segment (through which aqueous humor drains) can only be examined with Gonioscopy not otherwise due to a phenomenon called total internal reflection (requires a special instrument called gonioscope) 4- No but you can get an idea if there is severe narrowing of those channels by adjusting the torchlight sideways (only experts can comment not optometrists)