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Infectious Disease And Microbiology – Endophthalmitis
Endophthalmitis is a severe infectious condition involving the ocular (vitreous) cavity, while panophthalmitis refers to inflammation affecting all structures of the eye. It is a vision-threatening emergency most commonly occurring after ocular surgery, trauma, or via hematogenous spread from a distant infection.
The incidence of endophthalmitis after cataract surgery ranges from 0.1–0.3%, whereas it is significantly higher after penetrating ocular trauma (3–30%), especially when intraocular foreign bodies are present. Major risk factors include untreated eyelid disease (such as blepharitis), poor surgical technique, prolonged operative time, and intraoperative complications. Endogenous endophthalmitis is more likely in chronically ill, diabetic, or immunocompromised patients, particularly those with indwelling intravenous catheters or bloodstream infections.
Prevention strategies include routine postoperative use of topical fluoroquinolones after cataract surgery, although definitive evidence of benefit is limited. Intracameral cefuroxime has been shown to reduce postoperative risk. In high-risk penetrating ocular injuries, systemic prophylaxis with vancomycin or moxifloxacin may be used. For anterior segment trauma, intensive topical antibiotics or subconjunctival injections may achieve adequate antimicrobial levels. Patients with systemic infections, especially fungemia due to Candida species, should be monitored for possible endogenous spread to the eye.
The pathophysiology differs depending on the source. In postoperative cases, organisms from the eyelid or conjunctiva may enter through surgical wounds. In endogenous cases, pathogens disseminate hematogenously and initially involve the choroid before extending into the vitreous cavity.
Endophthalmitis may be caused by bacteria, fungi, or parasites. Common bacterial pathogens include Staphylococcus, Streptococcus, Pseudomonas, and Escherichia coli. Fungal causes include Candida, Aspergillus, and Fusarium. Parasitic causes include Taenia solium, Toxocara canis, and Toxoplasma gondii. Acute postoperative cases are most often due to Gram-positive organisms, whereas more severe infections and worse outcomes are associated with Gram-negative bacteria and streptococci. Trauma-related infections frequently involve mixed organisms, especially in rural injuries contaminated with organic material.
Clinically, most patients present with ocular pain, redness (conjunctival injection), photophobia, and reduced vision. In some cases, visual loss may be the only symptom. More aggressive infections, such as those caused by Bacillus cereus, can present rapidly with severe pain and profound vision loss. Panophthalmitis may cause pain with eye movement.
On examination, key findings include vitreous opacities, which are essential for diagnosis, and hypopyon (layering of white blood cells in the anterior chamber). Chorioretinal infiltrates are characteristic of endogenous infection.
Diagnosis involves obtaining aqueous and vitreous samples for microscopy and culture. Smears should be stained using Gram, Giemsa, and special fungal stains, and cultured for aerobic and anaerobic bacteria, mycobacteria, and fungi. Culture positivity is approximately 70% in postoperative cases. Imaging with ocular ultrasonography or CT scan is useful when visualization is limited or when a retained intraocular foreign body is suspected.
The differential diagnosis includes noninfectious causes such as uveitis, toxic anterior segment syndrome (TASS), and sterile postoperative inflammation due to retained lens fragments.
Management is an ophthalmologic emergency requiring immediate treatment. First-line therapy for acute postoperative bacterial endophthalmitis includes intravitreal injection of vancomycin for Gram-positive coverage and ceftazidime (or amikacin in β-lactam allergy) for Gram-negative coverage. Intensive topical antibiotics are also used. Systemic antibiotics are generally not beneficial in routine postoperative cases but may be considered with newer fluoroquinolones due to good ocular penetration.
In endogenous endophthalmitis, systemic antimicrobial therapy targeting the primary source is essential in addition to intravitreal treatment. For fungal infections, intravitreal amphotericin B is commonly used, though retinal toxicity must be considered. Systemic antifungal therapy is required in endogenous disease, with alternatives such as fluconazole, voriconazole, or caspofungin.
Supportive treatment includes pain management and cycloplegic eye drops. Corticosteroids may be used topically or periocularly to reduce inflammation, although systemic or intravitreal use remains controversial. Early referral to an ophthalmologist is critical.
Surgical intervention with pars plana vitrectomy is indicated in severe cases, especially when visual acuity is limited to light perception or worse. This procedure helps remove infectious material, toxins, and inflammatory debris, thereby improving outcomes.
Patients are typically managed as outpatients unless special circumstances require admission. Close daily follow-up is essential. If there is no improvement or worsening within 48 hours, repeat intravitreal antibiotics and/or vitrectomy should be considered.
Prognosis varies depending on the cause. Postoperative endophthalmitis has better outcomes than traumatic cases. After cataract surgery, approximately 50% of patients may achieve visual acuity of 20/40 or better, while outcomes are poorer in traumatic infections. Infections caused by Bacillus cereus have a particularly poor prognosis. Complications include permanent vision loss, retinal detachment, secondary glaucoma, and phthisis bulbi.
Endophthalmitis is a severe infectious condition involving the ocular (vitreous) cavity, while panophthalmitis refers to inflammation affecting all structures of the eye. It is a vision-threatening emergency most commonly occurring after ocular surgery, trauma, or via hematogenous spread from a distant infection.
The incidence of endophthalmitis after cataract surgery ranges from 0.1–0.3%, whereas it is significantly higher after penetrating ocular trauma (3–30%), especially when intraocular foreign bodies are present. Major risk factors include untreated eyelid disease (such as blepharitis), poor surgical technique, prolonged operative time, and intraoperative complications. Endogenous endophthalmitis is more likely in chronically ill, diabetic, or immunocompromised patients, particularly those with indwelling intravenous catheters or bloodstream infections.
Prevention strategies include routine postoperative use of topical fluoroquinolones after cataract surgery, although definitive evidence of benefit is limited. Intracameral cefuroxime has been shown to reduce postoperative risk. In high-risk penetrating ocular injuries, systemic prophylaxis with vancomycin or moxifloxacin may be used. For anterior segment trauma, intensive topical antibiotics or subconjunctival injections may achieve adequate antimicrobial levels. Patients with systemic infections, especially fungemia due to Candida species, should be monitored for possible endogenous spread to the eye.
The pathophysiology differs depending on the source. In postoperative cases, organisms from the eyelid or conjunctiva may enter through surgical wounds. In endogenous cases, pathogens disseminate hematogenously and initially involve the choroid before extending into the vitreous cavity.
Endophthalmitis may be caused by bacteria, fungi, or parasites. Common bacterial pathogens include Staphylococcus, Streptococcus, Pseudomonas, and Escherichia coli. Fungal causes include Candida, Aspergillus, and Fusarium. Parasitic causes include Taenia solium, Toxocara canis, and Toxoplasma gondii. Acute postoperative cases are most often due to Gram-positive organisms, whereas more severe infections and worse outcomes are associated with Gram-negative bacteria and streptococci. Trauma-related infections frequently involve mixed organisms, especially in rural injuries contaminated with organic material.
Clinically, most patients present with ocular pain, redness (conjunctival injection), photophobia, and reduced vision. In some cases, visual loss may be the only symptom. More aggressive infections, such as those caused by Bacillus cereus, can present rapidly with severe pain and profound vision loss. Panophthalmitis may cause pain with eye movement.
On examination, key findings include vitreous opacities, which are essential for diagnosis, and hypopyon (layering of white blood cells in the anterior chamber). Chorioretinal infiltrates are characteristic of endogenous infection.
Diagnosis involves obtaining aqueous and vitreous samples for microscopy and culture. Smears should be stained using Gram, Giemsa, and special fungal stains, and cultured for aerobic and anaerobic bacteria, mycobacteria, and fungi. Culture positivity is approximately 70% in postoperative cases. Imaging with ocular ultrasonography or CT scan is useful when visualization is limited or when a retained intraocular foreign body is suspected.
The differential diagnosis includes noninfectious causes such as uveitis, toxic anterior segment syndrome (TASS), and sterile postoperative inflammation due to retained lens fragments.
Management is an ophthalmologic emergency requiring immediate treatment. First-line therapy for acute postoperative bacterial endophthalmitis includes intravitreal injection of vancomycin for Gram-positive coverage and ceftazidime (or amikacin in β-lactam allergy) for Gram-negative coverage. Intensive topical antibiotics are also used. Systemic antibiotics are generally not beneficial in routine postoperative cases but may be considered with newer fluoroquinolones due to good ocular penetration.
In endogenous endophthalmitis, systemic antimicrobial therapy targeting the primary source is essential in addition to intravitreal treatment. For fungal infections, intravitreal amphotericin B is commonly used, though retinal toxicity must be considered. Systemic antifungal therapy is required in endogenous disease, with alternatives such as fluconazole, voriconazole, or caspofungin.
Supportive treatment includes pain management and cycloplegic eye drops. Corticosteroids may be used topically or periocularly to reduce inflammation, although systemic or intravitreal use remains controversial. Early referral to an ophthalmologist is critical.
Surgical intervention with pars plana vitrectomy is indicated in severe cases, especially when visual acuity is limited to light perception or worse. This procedure helps remove infectious material, toxins, and inflammatory debris, thereby improving outcomes.
Patients are typically managed as outpatients unless special circumstances require admission. Close daily follow-up is essential. If there is no improvement or worsening within 48 hours, repeat intravitreal antibiotics and/or vitrectomy should be considered.
Prognosis varies depending on the cause. Postoperative endophthalmitis has better outcomes than traumatic cases. After cataract surgery, approximately 50% of patients may achieve visual acuity of 20/40 or better, while outcomes are poorer in traumatic infections. Infections caused by Bacillus cereus have a particularly poor prognosis. Complications include permanent vision loss, retinal detachment, secondary glaucoma, and phthisis bulbi.
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