Limits...
The fundus slit lamp.

Gellrich MM - Springerplus (2015)

Bottom Line: The three lenses +90/+60/+40D are a good choice for imaging the whole spectrum of retinal diseases.A reconstruction of larger fundus areas is feasible for imaging in vitreoretinal surgery or occlusive vessel disease.Even a basic fundus controlled perimetry is possible.

View Article: PubMed Central - PubMed

Affiliation: Ophthalmological practice, Ziegeleiweg 10, 25548 Kellinghusen, Germany.

ABSTRACT
Fundus biomicroscopy with the slit lamp as it is practiced widely nowadays was not established until the 1980-es with the introduction of the Volk lenses +90 and +60D. Thereafter little progress has been made in retinal imaging with the slit lamp. It is the aim of this paper to fully exploit the potential of a video slit lamp for fundus documentation by using easily accessible additions. Suitable still images are easily retrieved from videorecordings of slit lamp examinations. The effects of changements in the slit lamp itself (slit beam and apertures) and its examination equipment (converging lenses from +40 to +90D) on quality and spectrum of fundus images are demonstrated. Imaging software is applied for reconstruction of larger fundus areas in a mosaic pattern (Hugin®) and to perform the flicker test in order to visualize changes in the same fundus area at different points of time (Power Point®). The three lenses +90/+60/+40D are a good choice for imaging the whole spectrum of retinal diseases. Displacement of the oblique slit light can be used to assess changes in the surface profile of the inner retina which occurs e.g. in macular holes or pigment epithelial detachment. The mosaic function in its easiest form (one strip macula adapted to one strip with the optic disc) provides an overview of the posterior pole comparable to a fundus camera's image. A reconstruction of larger fundus areas is feasible for imaging in vitreoretinal surgery or occlusive vessel disease. The flicker test is a fine tool for monitoring progressive glaucoma by changes in the optic disc, and it is also a valuable diagnostic tool in macular disease. Nearly all retinal diseases can be imaged with the slit lamp - irrespective whether they affect the posterior pole, mainly the optic nerve or the macula, the whole retina or only its periphery. Even a basic fundus controlled perimetry is possible. Therefore fundus videography with the slit lamp is a worthwhile approach especially for the many ophthalmologists without access to the most recent diagnostic equipment or a professional photographer at hand.

No MeSH data available.


Related in: MedlinePlus

(same eye as in Figure2). View through the slit lamp microscope if a 3.5 mm circular aperture is projected onto the central fundus through lenses with the power +90, +60, +40, +55D (see Figure 4). The higher the power of the examination lens, the less the magnification of the image visible in the slit lamp biomicroscope (also compare to Figure 2, bottom right, for the size of the illuminated fundus area).
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Fig3: (same eye as in Figure2). View through the slit lamp microscope if a 3.5 mm circular aperture is projected onto the central fundus through lenses with the power +90, +60, +40, +55D (see Figure 4). The higher the power of the examination lens, the less the magnification of the image visible in the slit lamp biomicroscope (also compare to Figure 2, bottom right, for the size of the illuminated fundus area).

Mentions: Aperture plate from Zeiss SL 105 slit lamp showing crescent-shaped and circular apertures. The red arrow points to the 3.5 mm circular aperture (which is projected onto the fundus in Figure 3). If this plate is rotated in an intermediate position, with the aid of the second aperture for the width of the slit beam (see yellow rectangle) two halfcircles visible in Figure 5 can be projected onto the fundus.


The fundus slit lamp.

Gellrich MM - Springerplus (2015)

(same eye as in Figure2). View through the slit lamp microscope if a 3.5 mm circular aperture is projected onto the central fundus through lenses with the power +90, +60, +40, +55D (see Figure 4). The higher the power of the examination lens, the less the magnification of the image visible in the slit lamp biomicroscope (also compare to Figure 2, bottom right, for the size of the illuminated fundus area).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401483&req=5

Fig3: (same eye as in Figure2). View through the slit lamp microscope if a 3.5 mm circular aperture is projected onto the central fundus through lenses with the power +90, +60, +40, +55D (see Figure 4). The higher the power of the examination lens, the less the magnification of the image visible in the slit lamp biomicroscope (also compare to Figure 2, bottom right, for the size of the illuminated fundus area).
Mentions: Aperture plate from Zeiss SL 105 slit lamp showing crescent-shaped and circular apertures. The red arrow points to the 3.5 mm circular aperture (which is projected onto the fundus in Figure 3). If this plate is rotated in an intermediate position, with the aid of the second aperture for the width of the slit beam (see yellow rectangle) two halfcircles visible in Figure 5 can be projected onto the fundus.

Bottom Line: The three lenses +90/+60/+40D are a good choice for imaging the whole spectrum of retinal diseases.A reconstruction of larger fundus areas is feasible for imaging in vitreoretinal surgery or occlusive vessel disease.Even a basic fundus controlled perimetry is possible.

View Article: PubMed Central - PubMed

Affiliation: Ophthalmological practice, Ziegeleiweg 10, 25548 Kellinghusen, Germany.

ABSTRACT
Fundus biomicroscopy with the slit lamp as it is practiced widely nowadays was not established until the 1980-es with the introduction of the Volk lenses +90 and +60D. Thereafter little progress has been made in retinal imaging with the slit lamp. It is the aim of this paper to fully exploit the potential of a video slit lamp for fundus documentation by using easily accessible additions. Suitable still images are easily retrieved from videorecordings of slit lamp examinations. The effects of changements in the slit lamp itself (slit beam and apertures) and its examination equipment (converging lenses from +40 to +90D) on quality and spectrum of fundus images are demonstrated. Imaging software is applied for reconstruction of larger fundus areas in a mosaic pattern (Hugin®) and to perform the flicker test in order to visualize changes in the same fundus area at different points of time (Power Point®). The three lenses +90/+60/+40D are a good choice for imaging the whole spectrum of retinal diseases. Displacement of the oblique slit light can be used to assess changes in the surface profile of the inner retina which occurs e.g. in macular holes or pigment epithelial detachment. The mosaic function in its easiest form (one strip macula adapted to one strip with the optic disc) provides an overview of the posterior pole comparable to a fundus camera's image. A reconstruction of larger fundus areas is feasible for imaging in vitreoretinal surgery or occlusive vessel disease. The flicker test is a fine tool for monitoring progressive glaucoma by changes in the optic disc, and it is also a valuable diagnostic tool in macular disease. Nearly all retinal diseases can be imaged with the slit lamp - irrespective whether they affect the posterior pole, mainly the optic nerve or the macula, the whole retina or only its periphery. Even a basic fundus controlled perimetry is possible. Therefore fundus videography with the slit lamp is a worthwhile approach especially for the many ophthalmologists without access to the most recent diagnostic equipment or a professional photographer at hand.

No MeSH data available.


Related in: MedlinePlus