Survey of Pathologic Microorganisms in the Streams Along the Tahoe Rim Trail.

IntroductionThis study aimed to estimate the contamination of water sources along the Tahoe Rim Trail (TRT) through evaluation of the presence and concentration of , and spp.MethodsSample sites were selected from 6 of the 8 sections of the TRT. Each stream was sampled 3 or 4 times during the summer and early fall of 2023.

Degradation of swept-parameter VEP responses by neutral density filters in amblyopic and normal subjects.

Purpose: To determine whether objective visual function, measured by swept-parameter visual evoked potential (sVEP), is preferentially degraded by neutral density filtration (NDF) in normal control and fellow eyes compared to amblyopic eyes, and to determine whether the response to NDF is a function of stimulus type, using grating and vernier stimuli.

Methods: Monocular Snellen acuity and both grating and vernier sVEP responses were measured in each eye of 23 children or adolescents with amblyopia and 21 visually and neurologically normal children or adolescents. Acuity and sVEP responses were measured with and without a 2.