This degree of resolution, however, was probably not obtained by our method. Note that according to the edge hypothesis, the 12 ′ point is not actually the peak but rather MP density measured at 6 min eccentricity. Peak MPOD (12 ′), MP density measured with a centrally fixated 12-min stimulus.
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© 1997 Optical Society of America Full Article |į, female M, male. These longitudinal data show that differences in MP density among subjects are maintained over time, if dietary patterns are stable. We also examined the temporal stability of the MP profile of four subjects over a time span of 4–14 months and for a single spatial location for ten subjects over a time span of 1–16 years. For individual cases, small deviations from an exponential function suggest the existence of minor flanking peaks or shoulders for 40% of the subjects. Assuming an exponential decay with eccentricity, once MP density has been measured in the center of the retina (denoted A), MP density at more eccentric locations ( X, deg) can be predicted with a standardized equation ( MP = A × 10 - 0.42 x ). An exponential decay with eccentricity explained more variance in the data than did a Gaussian function. The average spatial profile of MP density across subjects was fitted with both an exponential and a Gaussian function. Based on a linear interpolation between measured locations, the width of the spatial distribution of MP at half the maximal density averaged 1.03 deg, SD = 0.38, with a range of 0.25 to 1.9 deg.
The density varied by no more than 16% at these four locations, indicating a basically symmetric distribution. To assess the symmetry of the MP distribution, MP density was measured on the horizontal and vertical meridians at ± 1 deg eccentricity. Peak density of MP measured with a 460-nm, 12-arcmin stimulus averaged 0.58, standard deviation (SD) = 0.26, with a range of 0.175 to 1.39. Individual variations in the spatial profile of macular pigment (MP) density were measured for 32 subjects. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser.Note the Boolean sign must be in upper-case. Separate search groups with parentheses and Booleans.Keep it simple - don't use too many different parameters.
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