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Biomedical subjects

A J Adams

Publications and source records attributed to A J Adams.

103 records · Page 6Linked to original sources
PubMed1975

Alcohol and marijuana effects on static visual acuity.

Static visual acuity was measured at two contrast levels (12 and 49%) in ten subjects in a double blind experiment involving five drug conditions of alcohol and marijuana (0.5 ml and 1.0 ml/kg body weight of 95% ethanol, 8 and 15 mg delta-9-tetrahydrocannabinol (THC), and a placebo). We found no statistically significant change in static visual acuity for any of the dose levels at any of the measurement time up to six hours following drug ingestion; this is sharply contrasted with the marked decrements in acuity which were found in the same subjects under the same drug conditions when the targets were in motion and required corrdinated eye movements for their resolution.

Adolescent↗
PubMed1975

Color vision: blue deficiencies in children?

Recent publicized reports based on the use of the Farnsworth Panel D-15 test suggest that a large percentage of young children have a deficiency of blue vision (tritan type). In our study, 413 school children (ages 3 to 10) were tested with both the Farnsworth Panel D-15 test, as well as the A.O. H-R-R plates. None of the children failed either test for blue-yellow vision when traditional scoring instructions were observed. As in previous reports, we find that the children make a number of minor errors which adults rarely make. These errors show marked age-related patterns, being more frequent in younger children. However, further analysis of these errors revealed that the relative frequency with which particular error types were made on the D-15 test was significantly correlated with the existing perceived color difference data for the visually normal adult population. In addition, retesting significantly reduced all error types and reversing the test sequence demonstrated that most of the minor errors were made in the last half of the test regardless of the color vision task. The overall increase in the number of minor test errors seen with young children seems unrelated to color defects. The modified scoring methods in conjunction with the characteristics of the Panel D-15 test design account for the high percentage of errors classified as errors of blue vision.

Age Factors↗
PubMed1975

Marijuana smoking and reduced pressure in human eyes: drug action or epiphenomenon?

Normal pressure within the human eye was reduced after smoking a socially relevant dose of marijuana (12 mg. delta9-9-tetrahydrocannabinol), but only for light to moderate users who experienced a substantial "high" and a state of peaceful relaxation from the experimental dose. Analysis suggests an indirect effect of the drug associated with relaxation-a psychophysiologic state that can be produced by drug and nondrug means.

Adolescent↗