gonioscopy
Pronunciation: /ˌɡoʊniˈɑskəpi/
Diagnostic examination technique using a special contact lens to visualize the anterior chamber angle.
Full Definition
Gonioscopy is an essential diagnostic procedure in ophthalmology that allows direct visualization of the iridocorneal angle, which cannot be seen during standard examination due to total internal reflection. The technique uses a goniolens (typically Goldmann or Zeiss four-mirror lens) placed on the cornea to redirect light and provide a clear view of angle structures including the trabecular meshwork, scleral spur, and ciliary body band. Gonioscopy is crucial for glaucoma diagnosis, classification, and surgical planning, helping distinguish between open-angle and angle-closure mechanisms.
Usage
Usage note: Always specify the grading system used (Shaffer, Spaeth) when documenting angle assessment findings.
In Context
- "Gonioscopy revealed grade 2 narrow angles with trabecular meshwork visible only to the scleral spur." — Examination findings
- "Indentation gonioscopy was performed to assess for peripheral anterior synechiae." — Diagnostic procedure note