Abstract: This invention provides methods for determining whether a subject has a condition correlative with a matrix effect comprising (a) admixing (i) a suitably diluted sample of a suitable fluid from the subject and (ii) a suitable amount of a labeled molecule, wherein the labeled molecule is subject to a matrix effect with respect to the suitable fluid in a subject afflicted with the condition, and (b) after a suitable duration under suitable conditions, determining the amount of matrix-unaffected labeled molecule present in the resulting admixture, wherein the subject is afflicted with the condition if the amount of matrix-unaffected labeled molecule determined in step (b) correlates with a positive control for the condition, and wherein the subject is not afflicted with the condition if that amount correlates with a negative control for the condition. This invention also provides related methods, kits, and compositions.

Abstract: A novel optical subsystem is connected to an analyzing computer. The optical subsystem projects a grid of parallel lines onto a patient's retina, and a video camera in the optical subsystem captures a first retinal image and transmits it to the computer, where the image is digitized for analysis. A second image of the same eye is also captured, with the grid of parallel lines oriented perpendicular to the grid of the first image. The computer stores image data for the patient for a plurality of visits. The computer analyzes the images by forming a skeletonized topographical map of the retinal area of interest. First, a novel one-dimensional line detection algorithm is used to process the images. The line detection algorithm dilates, erodes and restores, Fourier transforms, bandpass filters, thresholds, skeletonizes, line traverses and interpolates the data for each of the two images. The resulting information is normalized to compensate for the effects of the patient's ocular optics.