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Mirror contact glasses
for laser treatment applications
.0 Gonioscopic contact glass CGAL
The CGAL gonioscopic contact glass was designed
by Roussel and Fankhauser for laser treatments of the
chamber angle. It is made of laser resistant glass and
is antireflection coated
1)
factor of 1.5 as compared to a Goldmann lens. There-
fore, lower energies are needed for cutting strands
in the cataract incision with the YAG laser. Thanks
to its magnifying effect, the CGAL contact glass also
improves aiming accuracy and success rate in laser
trabeculoplasty.
In office examination, the CGAL contact glass allows
the visualization of the fine structures of the trabecu-
lum with high resolution and produces brilliant photo-
graphs and video recording due to the low reflectivity
coating in the visible spectral region.
Optical Properties
The convex entrance surface preserves the laser
beam only convergence without introducing aberrati-
ons. It is this combination that results in minimal laser
spotsize and high optical resolution.
Magnification
Mirror angle
Magnification laser spot
on retina
Antireflection coating for visual observation
1)
and laser treatment:
450 - 650 nm and 1064 nm
. It reduces the laser spot by a
1.5x
58°
0.66x
1500.7200475.04060
Der Zielpunkt ist die Krüm-
mungsmitte C der spektralen
Eintrittsfläche und deshalb
frei von sphärischen Abwei-
chungen und Koma.
Le point cible est le centre
de courbure C de la surface
d'entrée du spectre, il est
donc exempt d'aberrations
sphériques et le coma.
The aiming point is the cen-
C
ter of curvature C of the spec-
tral entrance surface and as
such, free of spherical aber-
rations and coma.
Arbeitsbereich
Zone de travail
Working area
Die Abweichung der Strah-
len (ø) ist signifikant tiefer mit
dem CGAL als mit Goldmann
Kontaktgläsern (φ: Neigungs-
Goldmann
winkel Kontaktglas).
Les aberrations du rayon (ø)
sont bien moins importantes
avec le CGAL qu'avec toute
autre lentille de type Gold-
mann (φ: angle d'inclinaison
des lentilles de contact).
CGAL
The beam aberrations (ø) are
significantly lower with the
CGAL than with any Gold-
mann type lens (φ: tilting ang-
le of the contact glasses).
© Haag-Streit AG, CH-3098 Koeniz, Switzerland
CGAL
AR/Diode/YAG
1)
YAG532
58°
12 mm
• Gonio
Kontaktglas CGAL
Verre de contact CGAL
Contact glass CGAL
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