As a general rule, the longer the distance between the two optical paths, the better the stereoscopic view, but the narrower the binocular field of view in fundus examination. In reverse, the shorter the distance between the optical paths, the poorer the stereoscopic view, but the wider the binocular field of view in fundus examination.
With this in mind, we have achieved optics suitable for fundus examination by choosing the optimal 22mm as the inter-optical path distance.
300XL’s binocular tubes with a 6-degree convergence provide easy binocular fusion, ensuring stress-free observation.
Advanced multi-coating is applied to all lenses used in the microscope for excellent optical performance; bright images free from flare and ghost are obtained, improving the quality of examination and treatment.
As the diopter adjustment rings do not rotate with the eye caps, the selected diopters will not be accidentally changed during use.
In addition, the 12.5x high-eye point wide-field eyepieces enable observation over a wider field.
The lock ring at the foot of the joystick easily locks and releases the longitudinal and lateral movement of the base unit.
New joystick design uses silver metallic and moulded resin finish. The new ergonomic mechanism used in the pushbutton has improved ease of operation.
The filter dial, slit-length adjusting knob, slit rotation knob, and slit-width adjusting knob on the illumination unit are arranged for ease of use.
The slit-width adjusting knob can be rotated endlessly, and allows the slit width to be varied continuously from fully closed to fully open.
With the entire 70mm range of the chinrest elevation being lowered by 15mm, the 300XL can accommodate more diverse examinees than existing models.
The longitudinal movement range of the base unit is longer than conventional models (such as SM-70N) by 20mm. This will secure enough space between the patient and the microscope, allowing easier focusing and use of an indirect lens for fundus examination.
The 300XL’s headrest serves not only as a patient’s headrest but also as a finger rest for the examiner holding an indirect lens upon fundus examination. The finger rest feature is designed such that the examiner can hold the indirect lens steady. It also reduces arm fatigue from lengthy fundus examination.
Tilting of the slit beam is crucial when viewing temporal or nasal peripheral fundus. 300XL offers a prism tower with tilting mechanism as a standard feature.
Exact focusing is essential for examination and treatment. To achieve exact focusing, precise diopter adjustment is required. The 300XL comes with a focusing rod as standard equipment. When the focusing rod is not in use, the lid can be closed to prevent eye drops or dust from getting inside the slitlamp.
300XL has been chosen by a leading ophthalmic laser manufacturer to be used as the slitlamp for their retinal photocoagulation laser system, a system that demands high optical performance. This is recognition of Takagi’s high level of technical capabilities and the 300XL’s exceptional performance.
|Microscope||Type||Galilean converging binocular stereomicroscope|
|Magnification changer||Five-position rotating drum|
|Eyepieces||12.5x wide-field, high-eye point|
|Total magnification||5x, 8x, 12.5x, 20x, 31x|
|Real field of view (diameter)||45mm, 28mm, 18mm, 11mm, 7mm|
|Interpupillary adjustment||52 – 85mm|
|Diopter adjustment range||+/- 5 diopters|
|Base Unit||Longitudinal (coarse) movement||110mm|
|Lateral (coarse) movement||110mm|
|Horizontal (fine) movement||15mm|
|Chinrest Unit||Elevation stroke||70mm|
|Illumination Unit||Slit width||0-10mm continuously variable
(at 10mm, slit becomes a circle)
|Aperture diaphragm (diameter)||10mm, 7mm, 5mm, 3mm, 1mm, 0.3mm|
|Filters||HA (heat-absorbing), G (red-free), B (excitation)|
|Light source||12V 30W halogen bulb|
|Power Unit||Input voltage||AC100V – 240V (+/- 10%)|
|Power consumption||98VA (+/- 10% max.)|
|Fixation Light Unit
|Fixation light source||Red LED|