Scanning laser densitometry in visual acuity loss of unknown origin.
TLDR
Testing of foveal cone photoreceptor function using scanning laser densitometry may determine the location of pathological changes in certain patients with unexplained visual loss.Abstract:
AIM: To assess foveal cone photoreceptor function in patients with unexplained loss of central visual acuity. METHODS: Testing of foveal cone photoreceptor function was performed using scanning laser densitometry, colour matching (Rayleigh equation), and pattern electroretinography (ERG). Standard tests included full field ERG, electrooculography, visual evoked potentials, static perimetry, and fluorescein angiography. RESULTS: Decreased foveal cone photopigment density and abnormal pattern ERG were found in three patients. Results of colour matching were not unequivocal. CONCLUSION: Testing of foveal cone photoreceptor function using scanning laser densitometry may determine the location of pathological changes in certain patients with unexplained visual loss.read more
Citations
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Fundus reflectance--historical and present ideas.
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Photoreceptor function in eyes with macular edema
TL;DR: In this paper, the authors used a custom-built scanning laser ophthalmoscope (SLO) to assess photoreceptor function in various stages of macular edema and to relate the findings to visual acuity and angiographic changes.
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Simultaneous measurement of foveal spectral reflectance and cone-photoreceptor directionality.
TL;DR: An instrument for simultaneous measurement of foveal spectral reflectance and cone-photoreceptor directionality is described, and model analysis of the spectra provided densities of photostable ocular absorbers.
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Scanning laser densitometry and color perimetry demonstrate reduced photopigment density and sensitivity in two patients with retinal degeneration
TL;DR: Scanning laser densitometry with a modified Rodenstock SLO is a useful method to assess the human photopigment distribution and retinal sensitivity profiles and may help to measure exactly the temporal development of retinal diseases and the success of different therapeutic treatments.
References
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Book
Principles and practice of clinical electrophysiology of vision
TL;DR: The history and background of clinical electrophysiology is discussed, and the anatomy of the retina and principles of cell biology in the visual pathways at the molecular, physiological, and biochemical levels are introduced.
Journal ArticleDOI
Significance of abnormal pattern electroretinography in anterior visual pathway dysfunction.
TL;DR: The pattern electroretinogram (PERG) findings in 72 patients with disease of the anterior visual pathways are presented in relation to the site of dysfunction and two components of the PERG are described which are selectively involved in different pathologies.
Journal ArticleDOI
Reflectometry with a scanning laser ophthalmoscope
TL;DR: With noninvasive techniques to optimize reflectometry measurements, particularly retinal densitometry, which measures the photopigment density difference, unwanted scattered light is greatly reduced, and the retina is visualized during measurements.