a. What is the most likely diagnosis?

Answer
Postoperative bacterial endophthalmitis.

b. What are the other possible conditions?

Answer
Post-surgical inflammation
Retained lens materials
Flare-up of previous uveitis

Answer
Staphylococcus epidermidis.
 

Answer
Obtain vitreous for Gram staining and culture and sensitivity.
Intravitreal antibiotics.

AnswerAmikacin and vancomycin.

Answer
Intravitreal injection of broad-spectrum antibiotics alone without vitrectomy is sufficient for most patients with post-operative endophthalmitis. Vitrectomy and intravenous broad spectrum antibiotics may be indicated in patients with severe infectious post-operative endophthalmitis. 
 

Answer
Avoid operating on patients with blepharitis, conjunctivitis or lacrimal sac mucocele.
Clean the eyelids and lashes with 5% povidone-iodine and instilled it into the conjunctival fornices reduce the bacterial colony.
Careful draping of the eyelashes to keep them out of the surgical field.