Which ED ophthalmic exam uses a slit beam to view the anterior segment of the eye?

• A. Fluorescein Stain/Woods Lamp Exam
• B. Lumbar Puncture
• C. Slit Lamp Exam
• D. Central Line

Answer: (C)

Viewing the front part of the eye with a narrow, slit-like beam of light and magnification is performed with a slit lamp exam. This instrument produces a focused, adjustable beam that illuminates the cornea, iris, lens, and anterior chamber, allowing detailed cross‑sectional viewing and depth perception. It’s ideal for identifying corneal abrasions or foreign bodies, subtle corneal or lens problems, anterior chamber inflammation, and other injuries that require precise visualization of the anterior segment. Fluorescein staining can be used during ophthalmic evaluation to highlight surface defects under blue light, but the examination that specifically uses the slit beam to view the anterior segment is the slit lamp exam. The other options are unrelated procedures: lumbar puncture samples CSF, and placing a central line is a vascular access procedure.