By Marcus-Matthias Gellrich
In this publication the writer describes intimately the heritage, building, and exam power of the slit lamp. particularly, besides the fact that, he offers a brand new procedure – videography – that enables the ophthalmologist to record all eye illnesses with the slit lamp and a video digicam in a attainable, quick, and cheap demeanour. the mandatory equipment, ideas, and gear, together with converging, diverging, and call lenses, are truly defined within the textual content and 4 didactic movies. The 20 most crucial videographic settings are defined, and “recipes” for his or her use are offered, besides diagnostic guidance. The accompanying number of scientific pictures represents the world’s first ever normal atlas of ophthalmology from the viewpoint of the slit lamp. it's the author’s wish that this advent to ophthalmological videography, with its many photos by no means formerly produced with a slit lamp, will stimulate others to take advantage of the approach’s power.
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Extra resources for The Slit Lamp: Applications for Biomicroscopy and Videography
11 4. Indication: Light conduction is better in cystic than in solid tissue. This technique is wellsuited examining pigmented or highly vascularized tissue. In biomicroscopy of the fundus it may be used to outline drusen in the optic disc (see Fig. 48). 1 Conducted Illumination Proximal Illumination 1. Definition: proximal illumination refers to the high-contrast representation of a finding by illuminating neighboring tissue. The inner structures of nontransparent tissue are easier to see when the light is projected indirectly – the effect is as if the light source is within the tissue itself.
This concurrent absorption of information from various forms of illumination ordinarily occurs at the medium magnification most often employed in practice. As the magnification is intensified, the purely individual forms of illumination really show their mettle. 21 illustrates the intentionally combined application of two types of illumination using a conjunctival cyst as an example, where the cystic structure is visible in the optic section and the surrounding tissue is illuminated with diffuse external light.
Notice the simultaneous reduction in brightness with each increase in magnification (with only ambient light on the Lang cube, the details are much harder to make out – Fig. 22). Tip In this situation, you should direct the light from an indirect, battery-operated ophthalmoscope onto the Lang cube from a distance of about 20 cm. Everything is easy to discern (Fig. 17). This simple experiment shows that the slit lamp can even function without electricity. 4 times greater than 5×). However, few of us have reflected on the viewing distance upon which the magnification changer’s scale is based.