[Near triad measurement--accommodative pupillometry with horizontal eye tracking and its qualitative analysis].

Purpose: Recording of "near triad responses" was done by static accommodative stimulation to reveal the qualitative analysis of asthenopia.

Method: Twelve healthy subjects in agegroups of 20, 30, and 40 years were examined before and after several hours of visual display terminal (VDT) work after informed consent. Three trials of forward <-> backward movement of focusing on a target were carried out.

[Near triad meter--dynamic measurement of pupillometry with horizontal eye tracker by accommodative stimulation].

Purpose: A newly developed "Near Triad Meter" is a useful tool to record the dynamics of pupils and horizontal eye movements in both eyes simultaneously with the accommodative stimuli. The responses show insufficiency or strain for accommodation. In this study the objective accommodative power (in diopters, D) is calculated by the measurement of pupillary constriction-ratio(CR) and compared in 4 age groups to find the age-related decrement of diopter values.