In microbial keratitis, when might steroids be considered safe to use?

In microbial keratitis, when might steroids be considered safe to use?

• A. Never
• B. Only after ulcer is sterilized and re-epithelialized
• C. Always at presentation
• D. Only if there is posterior segment involvement

Answer: (B)

The key idea is that steroids in microbial keratitis are safe only after the infection has been controlled. Steroids suppress the local immune response, which can allow an active infection to worsen if given too early. Therefore, using steroids at the initial presentation is risky because it can let organisms continue to proliferate or invade deeper into the cornea. Once the ulcer is sterilized and the epithelial surface has re-epithelialized, the inflammatory damage in the corneal stroma becomes the main threat to vision. At this point, a carefully chosen steroid can reduce ongoing inflammation, limit scarring and edema, and help preserve vision, as long as antimicrobial therapy is still being used and the infection remains controlled. The decision hinges on confirming there’s no active infection rather than on features like posterior segment involvement alone.

The key idea is that steroids in microbial keratitis are safe only after the infection has been controlled. Steroids suppress the local immune response, which can allow an active infection to worsen if given too early. Therefore, using steroids at the initial presentation is risky because it can let organisms continue to proliferate or invade deeper into the cornea.

Once the ulcer is sterilized and the epithelial surface has re-epithelialized, the inflammatory damage in the corneal stroma becomes the main threat to vision. At this point, a carefully chosen steroid can reduce ongoing inflammation, limit scarring and edema, and help preserve vision, as long as antimicrobial therapy is still being used and the infection remains controlled. The decision hinges on confirming there’s no active infection rather than on features like posterior segment involvement alone.