A study has shown that gonioscopy using a
red-free (green) filter can enhance visibility of the iridocorneal angle.
The angles were imaged with an indirect
4-mirror goniolens with standard halogen light, red-free green filter and also
warm light filter of the slit lamp. The images and videos were recorded using a
smartphone adaptor to the slitlamp. The illumination was set at 1/4th
with 20x magnification.
The study found that the contrast of the gonioscopy
images was enhanced objectively with a red-free filter compared to standard
light photos. The built-in warm filter of the slit lamp also provided better
visualization of the iridocorneal angle structures.
The evaluation of the images and videos by
two glaucoma specialists revealed that the red-free (green) filter provided
enhanced tissue visualization for the pigmentation of the trabecular meshwork
in 90% (n = 9) of the cases, and the quality of visualization did not worsen
during regular gonioscopy.
Also, the warm color provided good contrast
between the angle structures, as well as being less irritating to the
photosensitive patients. This filter was also found to be superior in
identifying the Schlemm’s canal, as it appeared orange or red, unlike the usual
halogen light appearance, where it appears white and is often difficult to
identify.
VIEW VIDEO HERE: https://www.youtube.com/watch?v=bgRP3EmCC3Q
REFERENCE: Iqbal MI. Red-Free (Green) Filter-Enhanced
Gonioscopy with Smartphone: A Pilot Study. Cureus. 2024 Jan 3;16(1):e51559.
doi: 10.7759/cureus.51559. PMID: 38313936; PMCID: PMC10835508.
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