Measurement of minimum angle of resolution (MAR) for the spatial grating consisting of lines of two colors |
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Affiliation: | 1. Centro de Investigaciones en Óptica, C.P. 37150 León, Gto., Mexico;2. Departamento de Ingeniería Robótica, Universidad Politécnica del Bicentenario, C.P. 36283 Silao, Gto., Mexico;3. Centro de Tecnologías Ópticas y Fotónicas, Universidad Tecnológica de Tulancingo, C.P. 43642 Tulancingo, Hgo., Mexico;4. Laboratorio de Óptica Física, Posgrado en Física Aplicada, Benemérita Universidad Autónoma de Puebla, C.P. 72570 Pue., Mexico |
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Abstract: | Minimum angle of resolution (MAR) was measured for the grating which consisted of lines of two colors selected from Red, Green, Blue, White and Black. Method of two alternative forced choice (2AFC) was used where the participants were asked to answer the direction of the color grating of the horizontal or vertical directions. From the measured psychometric function of the ratio of the correct answers, MAR which corresponded to the threshold of 75% correct answer ratio was determined. MAR of the grating patches with more than one primary color was measured to be affected by the combination of colors and to be 10–30% larger than that of the grating patch of White–Black. While the resolving power for Blue pattern had been known to be worse than those for Green and Red patterns, MAR of the grating including Blue was not always the worst. |
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Keywords: | Minimum angle of resolution (MAR) Two alternative forced choice (2AFC) Visual acuity Grating |
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