ISSN:
1573-2622
Keywords:
Electroretinogram
;
Fourier analysis
;
Naka-Rushton equation
;
Obesity surgical therapy
;
Oscillatory potentials
;
Vitamin A deficiency
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract New possible causes and unexplored aspects of the electroretinogram were evaluated in a case of vitamin A deficiency secondary to surgical therapy for morbid obesity. The Naka-Rushton equation, applied to the scotopic b-wave, demonstrated the quantal catch reduction caused by the loss of rhodopsin in the outer segment of photoreceptors. Study of the Fourier analysis of the photopic 20-Hz response suggested a primary involvement of the external retinal layers, with an indirect alteration of the inner layer. The electroretinogram oscillatory potentials showed alterations explained by the involvement of their generators related to the primary photoreceptor lesion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01203334
