Bacterial eye infections occur when organisms like Staphylococcus, Streptococcus, Haemophilus, or Pseudomonas invade the conjunctiva, eyelid margin, or cornea. The most common form is bacterial conjunctivitis (“pink eye”), which produces the classic thick yellow-green discharge, crusty lids upon waking, and a gritty foreign-body sensation. More serious forms include bacterial keratitis (a corneal infection seen most often in contact lens wearers) and bacterial styes and lid infections.
Bacterial infections respond rapidly to the right prescription antibiotic — but identifying them quickly matters. The wrong diagnosis (treating a viral infection with antibiotics, or missing a contact-lens-related corneal ulcer) can delay healing or risk permanent damage. Dr. Patel uses slit-lamp examination and clinical judgment to confirm the diagnosis and select the most effective antibiotic for your case.
Contact lens wearers, take note: any red, painful eye while wearing contacts is urgent. Stop wearing your lenses, bring the case and solution to your appointment, and book the same day to rule out bacterial keratitis.
Not sure if it's bacterial? See our pink eye overview to compare bacterial, viral, and allergic causes — or read about viral eye infections if your discharge is watery rather than thick.
Symptoms
The hallmark sign — much heavier and more colored than the watery discharge of viral infections.
Dried discharge cements the lashes overnight, requiring a warm compress to gently open the eye.
Pink to red discoloration of the white of the eye, often starting in one eye and sometimes spreading.
Bacterial infections typically come on quickly, often within 24 hours, unlike the more gradual onset of viral.
A foreign-body feeling, as if there is sand in the eye — common but not specific to bacterial infection.
Significant pain or photophobia is a red flag for corneal involvement and warrants urgent evaluation.
We hold urgent slots every day for red eye appointments — call us first thing in the morning.
We prescribe antibiotics only when bacteria are likely — protecting you and the community from resistance.
Dr. Patel is a contact lens specialist and treats lens-related infections with extra rigor and follow-up.
Frequently Asked Questions
Most patients see noticeable improvement within 24 to 48 hours of starting prescription antibiotic drops. Discharge decreases, redness fades, and crusting resolves. It is essential to complete the full course — usually 5 to 7 days — even if symptoms improve early, to prevent recurrence and resistance.
You are generally considered non-contagious 24 hours after starting antibiotic drops, provided your symptoms are improving. Most schools and workplaces will allow return at that point. Continue good hand hygiene throughout treatment.
Yes, treat it as urgent. Contact lens wearers are at much higher risk for bacterial keratitis, a corneal infection that can scar and threaten vision. Stop wearing your lenses immediately, switch to glasses, and book a same-day appointment. Do not wait to see if it improves on its own.
Different bacteria respond to different antibiotics, and ophthalmic drops have an opened-bottle expiration of about 4 weeks due to contamination risk. Using old drops can introduce new bacteria, mask the real problem, and contribute to antibiotic resistance. Dr. Patel will prescribe the right medication based on your current infection.
In adults, Staphylococcus aureus and Streptococcus pneumoniae are the most common organisms. In children, Haemophilus influenzae is also frequent. Contact lens wearers are at elevated risk for Pseudomonas aeruginosa, an aggressive organism that can rapidly damage the cornea and requires urgent treatment.