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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Print: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v72.i15.70
pages 1431-1437

VARIABLE ARRAY PATTERNS FOR MULTIFOCAL ELECTRORETINOGRAPHY

C. A. Herrera-Ramirez
National Polytechnic Institute of Mexico (IPN), ESIME-UPC, Mexico
Luis Nino-de-Rivera
National Polytechnic Institute of Mexico (IPN), National Institute for Astrophysics, Optic & Electronics, Puebla, Mexico

ABSTRACT

The multifocal electroretinography (mfERG) response is associated with using a structured stimulus, usually by an array of hexagonal elements projected in the central 40°−60° degrees of the retina. A series of waves are obtained by mfERG usually with 61,103 and till 241 elements of the stimulus pattern. However, higher resolution of the mfERG system is still an open problem, which improvement requires a higher number of elements in the pattern in order to stimulate the smallest possible retina area. This approach has to overcome many problems related mainly with the low voltage amplitude and response to stray light with amplifier technology. We present in this paper results from a significant reduction in the area of each hexagonal area of stimulus pattern using technology at hand through Itan Technologies RHA2216biosignal amplifier. The paper discusses too a new strategy for the stimuli considering a variety of resolutions, long variable sequences, frame rates and colours. This paper shows the results of stimulation tests performed on healthy human subjects who were stimulated with standard 61 to 153 patterns, which results are compared with our improved proposal from 519 to 1997 hexagonal patterns that improving low voltage cone response and stray light problems.


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