What Is Slit Illumination?
The primary diagnostic technique used with the slit lamp biomicroscope, where a thin, focused beam of light (a slit) is projected obliquely across the anterior segment of the eye.
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Cross-Sectional View
The light beam creates an optical cross-section (like a slice), allowing the examiner to visualize the depth and clarity of the cornea, anterior chamber, and crystalline lens.
Grading Cataracts
Crucially used to assess the density and exact location (cortex, nucleus, capsule) of cataracts, which appear as opacities within the lens "slice."
Anterior Chamber Depth
The technique also allows the examiner to estimate the depth of the anterior chamber, which is vital for glaucoma risk assessment (narrow angle). The distance between the posterior corneal surface and the anterior iris surface is viewed.
What does 'flare' mean in the anterior chamber?
'Flare' seen with slit illumination is the subtle presence of protein in the aqueous humor, indicating inflammation (uveitis).
Why is the beam thin?
A thin beam provides higher resolution and better contrast, allowing the clinician to distinguish individual layers of the cornea and lens.
What is the best angle for a cross-section?
The best cross-sectional view is achieved when the illumination beam and the microscope axis are angled at approximately 45 degrees to each other.