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Analysis of blue light pixels for detection of preferred retinal locus

Detection of ‘Preferred Retinal Locus’ (PRL) in human eyes is one of the important tests duringclinical assessment for treatment of certain retinal lesions. Significance of blue light has beenanalyzed in this paper using simple image processing algorithm in detecting PRL. Fundusphotographs of 19 patients, (eleven normal and eight central retinal lesions) were taken for theanalyses of RGB pixel intensities. Along with Red Maximum (Rmax), Green Maximum (Gmax)and Red Green maximum (R + Gmax), Blue Minimum (Bmin) pixel intensity values were alsoobtained for all the images. Blue pixel values were found to be minimum in fovea for all 100% of the normal retinal images. For PRL retinal images, Bmin method matched the location in 88% of images. This method signifies that the analysis of blue light for patients with eccentric fixationis a good alternative compared to scanning laser ophthalmoscope (SLO) and microperimetry

Author(s): Venkataramana Kalikivayi, Kannan K and Ganesan AR