| Lens |
Type |
General features |
Advantage |
Disadvantage |
| Goldman 3-Mirror |
Indirect |
DIMENSION
12 mm diameter
3 mm flange width
MIRRORS
3 mirrors 10-12 mm high,
9 mm wide
effective field: 80 degrees
Angle 59 degrees
(gonioscopy mirror) |
Excellent gonioprism for neophyte to learn anatomy, viscous bridge creates suction effect stabilizing eye for examination and laser therapy. |
Goniogel required for best view which obscures patient's vision and may compromise further same-day diagnostic tests, corneal abrasion in compromised cornea, part of angle hidden in narrow-angled eyes, time consuming when necessary to evaluate both eyes, potential for artificial narrowing/widening of the angle. |
| Goldman 1 Mirror |
Indirect |
DIMENSION
12 mm diameter
1.5 mm flange width
MIRROR
1 mirror 12 mm high,
9 mm wide
Angle 62 degrees |
Same as Goldman 3 mirrors |
Same as Goldman 3 mirrors |
| Allen -Thorpe |
Indirect |
PRISMS
4-62
degrees mirrors
|
Same as Goldman 3 mirrors |
Same as Goldman 3 mirrors |
| Ritch |
Indirect |
DIMENSION
12.5 mm diameter
MIRRORS
2-64 degrees mirrors
(superior angle viewing)
2- 59 degrees mirrors
(inferior angle viewing)
effective field: 90 degrees
17D plano-convex button over two mirrors (1.4 X magnification) |
Same as Goldman 3 mirrors |
Same as Goldman 3 mirrors |
| Magna View |
Indirect |
DIMENSION
15-18 mm
MIRROR
One 62 degree mirror
1.3 magnification
|
It has a broader viewing area than the Goldmann lens and a convex anterior face that provides slight magnification. This lens was designed for the delivery of laser energy to the angle. |
Same as Goldman 3 mirrors |