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Direct contact glasses
for laser treatment applications
. Retina contact glass CGRL
The CGRL is a wide angle contact glass designed for
laser photocoagulation and diagnosis of the retina. It
is made of laser resistant glass and is antireflection
coated
. The optical design with a concave entran-
1)
ce surface allows a wide angle observation and laser
treatment without intermediate imaging and without
the associated intermediate focal spot inherent to in-
direct ophthalmoscopy.
The result is a small, lightweighted contact glass
which increases the field of view, without increasing
the working distance, while providing an excellent
image quality and good resolution. The whole poste-
rior pole including the temporal vascular arcades, can
be viewed simultaneously. It is used for axial and pa-
raxial photocoagulation.
Optical Properties
The CGRL Retina contact glass creates an upright
virtual image of the fundus. The cone angles of both
laser and observation beam are reduced from 6° in
air to 3.2° in vitreous. As a consequence the field of
view is increased from 46° to 64°, which allows ob-
servation of the whole posterior pole.
Dioptric power in air
Magnification
2)
Field of view
Magnification laser spot
on retina
Antireflection coating for visial observation and laser treat-
1)
ment: 450 - 650 nm
The magnification with the Goldmann lens is arbitrarily set
2)
equal to 1.
- 50 D
0.75x
64°
1.33x
1500.7200475.04060
Verre de contact CGRL
Optischer Weg eines Laser-
strahls durch das CGRL-
Kontaktglas.
Chemin optique du rayon
laser à travers le verre de
contact CGRL.
Optical path of a laser
beam through the CGRL
contact glass.
Arbeitsbereich
Zone de travail
Working area
© Haag-Streit AG, CH-3098 Koeniz, Switzerland
CGRL
AR/Diode
1)
YAG532
64°
12 mm
• Retina
Kontaktglas CGRL
Contact glass CGRL
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