What is this instrument? How would you use it?

Answer
This is a right Snellen entropion forceps. The forceps controls bleeding
and serves as lid guard during full-thickness lid incision. 

What is this instrument?

Answer
Kelly's descemet membrane punch. It is used to create a trap door following the creation of a scleral flap.
 
 
 

a

b

What are these instruments and how do they differ?

Answer
They are needle holder. a is Castroviejo needle holder and b 
Barraquer needle holder. The main difference is that a has a locking mechanism which is absent in b.

 

End of viva 5