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O P H T H A L M O L O G Y
that provides both. Microscopes with high-intensity transmission
optics let you use a lower light level for retinal procedures, thereby
lowering the risk of macular phototoxicity. Another useful feature is
the presence of an additional oblique beam with a separate adjustment
control. The beam can be used to illuminate features of the ocular surface and can be dimmed to better visualize intraocular structures. A
slit beam illuminator to improve visualization of delicate structures
such as epiretinal membranes or the posterior lens capsule is useful
for both posterior and anterior segment surgeons. From a workflow
standpoint, ask about the cost of bulbs and the average bulb lifespan
for each microscope. The standard range of magnification for ophthalmic microscopes is 6X to 25X. Does the microscope have programmable magnification presets that can be individualized for each
surgeon?
2. How will the optics help your docs?
Unless you have a degree in physics, comprehending the designs of
optical systems built into ophthalmic microscopes can be daunting.
Some microscopes boast optical systems that generate collimated, nonfocused light; others promote focused, coaxial, double-beam, stereo
illumination or apochromatic optics that reduce chromatic aberration,
which results in improved contrast and resolution. From a practical surgical perspective, it's crucial to have a microscope that maintains a
bright and stable red reflex, high resolution and long depth of focus.
Another optical feature to consider is the availability of a viewing system that integrates with the microscope to let retinal surgeons view all
areas of the fundus without the aid of a contact lens or endoilluminator.
3. What about scope ergonomics?
There are many ergonomic features to look for in an ophthalmic
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