ABSTRACT
PURPOSE: To explain hypothesis that there are two types of human retinal capillary pathways. One is simple type and the other is complex type. The former plays a role in blood flow regulation and the latter does capillary function itself. METHODS: We measured the length, tortousity, and flow velocity of human retinal capillaries using Fluorescein Leukocyte Angiography (FLA) with a Scanning Laser Ophthalmoscope (SLO) on two healthy adult male volunteers. We studied distribution and pathways of human retinal capillaries on the posterior pole. RESULTS: The lengths of capillaries were distributed with two peak incidence. One was 70 microgram and the other 240 microgram. There was no relationship between capillary length and tortousity. The correlation between capillary length and leukocyte velocity showed that the shorter capillary group has a wide range of velocity but the longer group has a narrow range of velocity. CONCLUSIONS: Two types of retinal capillary pathways exist on human retina. Compared with two types of capillaries on the cat retina described by Ben-nun et al, we found that the shorter capillary type plays a role in blood flow regulation and the longer type in capillary function itself.
Subject(s)
Adult , Animals , Cats , Humans , Male , Angiography , Capillaries , Fluorescein , Incidence , Leukocytes , Ophthalmoscopes , Retina , Retinaldehyde , VolunteersABSTRACT
We reviewed 79 cases(133 eyes) of diabetic retinopathy which were treated by panretinal photocoagulation(PRP) and, if necessary, additional treatments, to find the factors which influence either regressed or persisted neovasculization and cause late vitreous hemorrhage after laser treatment. After PRP, 21 eyes(16%) gained 2 or more lines, 64 eyes(48%) were within 1 line and 48 eyes(36%) lost 2 or more lines of visual acuity. After PRP, neovasculization was regressed in 39 eyes and persisted in 42 eyes. Vitreous hemorrhage occurred in 22 eyes at 9.4 months after completion of initial PRP on the average. The duration of diabetes, the level of fasting blood glucose and the presence of neuropathy, nephropathy or hypertension showed no statistically significant correlation to persisted neovasculization or vitreous hemorrhage after laser treatment.
Subject(s)
Blood Glucose , Diabetic Retinopathy , Fasting , Hypertension , Light Coagulation , Visual Acuity , Vitreous HemorrhageABSTRACT
We reviewed 79 cases(133 eyes) of diabetic retinopathy which were treated by panretinal photocoagulation(PRP) and, if necessary, additional treatments, to find the factors which influence either regressed or persisted neovasculization and cause late vitreous hemorrhage after laser treatment. After PRP, 21 eyes(16%) gained 2 or more lines, 64 eyes(48%) were within 1 line and 48 eyes(36%) lost 2 or more lines of visual acuity. After PRP, neovasculization was regressed in 39 eyes and persisted in 42 eyes. Vitreous hemorrhage occurred in 22 eyes at 9.4 months after completion of initial PRP on the average. The duration of diabetes, the level of fasting blood glucose and the presence of neuropathy, nephropathy or hypertension showed no statistically significant correlation to persisted neovasculization or vitreous hemorrhage after laser treatment.