The human eye is an extremely delicate organ, and so performing ophthalmic surgery requires the ability to monitor progress on a micro-level. Ophthalmic operating microscopes are designed to provide high contrast and detailed imaging of all regions of the human eye. When choosing an ophthalmic operating microscope, it is important to pay attention to the type of optics employed. An apochromatic lens (or apo) will provide high light transmission, permitting high-quality imaging at lower light intensities. Certain models of ophthalmic surgery microscope provide multiple lighting options such as the ability to switch between halogen and xenon. An ophthalmic surgical microscope can either be fixed or adjustable, and some models provide a second “observer” set of binoculars, some of which can independently adjust the focusing mechanism.
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| Company | Haag-Streit USA, Inc. | Haag-Streit USA, Inc. |
| Item | Allegra 90 Surgical Microscope | Allegra 900 Surgical Microscope |
| Price | | |
| Description | The Allegra 90 surgical microscope from Haag-Streit features a compact optical head design ideal for office and small procedure use. With the best 3D depth perception in the market, a large depth of field, and brilliant red-reflex, you don’t have to | Engineered for cataract surgery, the Allegra 900 from Haag-Streit is a simple yet effective microscope for anterior segment surgery. It features Haag-Streit optics, a large depth of field, and the best 3D perception on the market. The Allegra 900 |
| Features |
- 25 mm stereo base
- C.RED
- Fixed red reflex
- Halogen lighting systems
- Motorized focus and zoom
- Manual five-step magnification
- Access filters and diaphragms using a sterilizable knob
- Optional X-Y coupling
- Optional: EIBOS 2
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- 25 mm stereo base
- C.RED
- Fixed red reflex
- Halogen or LED lighting systems
- Full tilt range for iStent procedures
- Wireless foot switch
- Integration with ORA, Holos, and other third party systems
- Manual five-step magnification
- Optional X-Y coupling
- Optional: EIBOS 2 compatible – posterior segment surgery
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| Magnification | 5 steps, 3.3x to 30.3x | Motorized zoom 1:6, 4.3x to 25.7x |
| Filters | 2 diaphragm sizes, 5 color filters including UV, softlight, daylight, blue, slit | UV, softlight, daylight, blue, slit, 2 diaphragm sizes |
| Optics | Apochromatic | Apochromatic |
| Focusing Range | Motorized 50mm | Motorized 50mm |
| Working Distance | 200 mm, optional 175 mm, 225 mm, 250 mm, 300 mm, 400 mm | 200 mm, optional 175 mm, 225 mm, 250 mm, 300 mm, 400 mm |
| Light Source | Halogen or LED | Halogen or LED |
| Objective Lens | F=200mm or f=175mm | F=200mm or f=175mm |
| X-Y Coupling | 60mm x 60mm | 60mm x 60mm |
| Stereo Base | 25 mm | 25 mm |
| Inclination | -70° to +90° | -70° to +90° |
| Illumination Field | 3.0mm to 60mm | 3.0mm to 60.0mm |
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