Mainster (Standard) Focal/Grid


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The Mainster Focal/Grid Laser Lens provides high lateral magnification which offers excellent retinal detail while its high axial magnification permits appreciation of subtle intraretinal details and retinal thickening.
It offers high retinal resolution, excellent visibility through hazy media and minimal beam astigmatism in the field periphery.
It is the lens of choice for diagnosing and treating macular edema in diabetic retinopathy and branch retinal vein occlusion.
No methycellulose is required during routine eye examinations on the OMRA-S-2 style.


As with any indirect ophthalmoscopy contact lens, some time is needed to become familiar.
Suggestions for use are:
- Use the slit lamp with its illumination and observation arms lined up so that illumination and observation are parallel.
- Use a vertical slit beam with the illumination beam as narrow and short as possible to minimize back-scattered slit lamp light that can decrease image contrast.
- Use slit lamp magnification between 5x and 12x.
- Tilt the lens on the patient's cornea to select your viewing area and optimize image clarity and stereoscopic view.
- Keep the front surface of the lens perpendicular to the viewing axis and the laser beam.
- Have the patient turn their eye slightly for larger changes in viewing area location.

Since this lens presents an image in air rather than within the lens, the slit lamp must be moved further back from the patient's eye, as compared with conventional lenses. It is sometimes helpful to start by using the lowest slit lamp magnification with the lens centered in the field of view, then move the slit lamp away from the patient until the image is acquired.
Restricted posterior movement of the older Zeiss 125 slit lamp requires the patient's forehead be moved backward from the headrest. This positioning may be achieved by placing a one inch thick sponge strip between the patient's forehead and the headrest.

Lens PRP
120 PB(3)
Static Field
of View
165° 118° 120° 120° 102° 117° 90° 75°
Dynamic Field
of View
180° 127° 133° 136° 133° 142° 121° 88°
Image Magnification .51x .68x .63x .50x .95x .50x .96x 1.25x
Laser Spot Magnification Factor(2) 1.96X 1.50X 1.60X 2.00X 1.05X 2.00X 1.05X .80X
Retinal Disorder(1) Procedure +++ Optimal    ++ Very useful    + Useful    - Not useful
NVD, NVE or NVI PRP, Clear Media +++ ++ ++ ++ ++ ++ + -
NVD, NVE or NVI PRP, Vitreous Hermorrhage ++ +++ +++ +++ ++ +++ + -
Macular Edema Focal + Grid + + + + +++ ++ +++ ++
CNV in ARMD Focal - - - - +++ - +++ +++
or OHS PDT, TTT + +++ +++ + +++ +++ +++ +++
Retinal Holes Peripheral +++ + + + + + - -

(1)NVD, NVE, NVI: neovascularization - disc, retinal elsewhere, iris; CNV: choroidal neovascularization; ARMD: age-related macular degeneration; OHS: ocular histoplasmosis syndrome.
(2) Multiply the laser photocoagulator spot size setting by this magnification factor to calculate the retinal spot size produced by each lens. Note that "x" and "X" are used for image magnification and laser spot magnification, respectively.
(3) The ProRetina's tubular design facilitates examination and treatment of patients with prominent brows. It also allows easy lens manipulation for examination and treatment of the retinal periphery.
(4) Focal/Grid is the new name for the Mainster Standard.

Ocular Mainster (Standard) Focal/Grid argon/diode laser lens, 0.96x image mag. 1.05x laser spot mag. 16mm contact diameter, 90º static FOV, 121º dynamic FOV.

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