**1. Introduction**

Endophthalmitis in general is classified into infectious and non-infectious categories. Furthermore, infectious endophthalmitis is subclassified into exogenous and endogenous (**Box 1)** [1–5]**.**

Although the term endophthalmitis refers to an infectious or non-infectious inflammation, its use often refers to an infectious origin. Exogenous endophthalmitis is caused by inoculation of the eye by either bacterial or fungal microorganisms from an external environment and most commonly occurs as a complication of ocular surgery, traumatic open globe injuries, or intravitreal injections [2]. Acute postoperative endophthalmitis occurs within 6 weeks of the intraocular surgery or procedure [3].

The incidence of endophthalmitis after various intraocular procedures is low, and it is illustrated in **Table 1** [6–15].


## **Box 1.**

*Classification of Endophthalmitis.*


## **Table 1.**

*Different intraocular procedures and incidence of endophthalmitis.*


## **Table 2.**

*Microorganisms causing infectious endophthalmitis.*

Causative microorganisms of infectious endophthalmitis in general are listed and summarized in **Table 2** [15]. Intraocular inflammation caused by viruses, protozoa, or helminths is usually named uveitis.
