GLASSES-LENS ASSESSMENT METHOD, GLASSES-LENS DESIGN METHOD USING ASSESSMENT METHOD, AND CALCULATION METHOD FOR VISUAL-PERFORMANCE CHARACTERISTICS OF TEST SUBJECT WHEN VIEWING OBJECT THROUGH LENS
[Problem] To provide: an assessment method capable of objectively assessing the average visual performance over a comparatively long period of time when a test subject looks through a glasses lens to be assessed, changes over time in this visual performance, and visual performance when looking with both eyes a design method and a calculation method for the visual-performance characteristics of the test subject when viewing an object through a lens. [Solution] An assessment of a lens to be assessed and the visual-performance characteristics of a test subject is made by: having a test subject wear a lens to be assessed inducing brain activity in the test subject by having the test subject observe, through the lens to be assessed, a changing visual stimulus which induces brain activity having periodicity recording over time the slight changes in electric current caused by this brain activity as a magnetic field (magnetic flux density) by using a magnetoencephalograpic meter analyzing the waveform thereof by using high-speed Fourier analysis, and calculating one or more of the amplitude, power value and phase in the frequency which is the inverse of the period of the brain activity having periodicity and assessing by using the size of the obtained amplitude or power value, or the speed of the obtained phase.Linvention vise à fournir : un procédé dévaluation permettant dévaluer de manière objective la performance visuelle moyenne sur un intervalle de temps comparativement long lorsquun sujet testé regarde à travers un verre de lunettes à évaluer, des variations de cette performance visuelle au cours du temps, et la performance visuelle lorsque le sujet regarde avec ses deux yeux un procédé de conception et un procédé de calcul de caractéristiques de performances visuelles du sujet testé lorsquil visualise un objet à travers un verre. A cet effet : une évaluation dun verre à évaluer et des caractéristiques de performances visuelles dun sujet testé consiste : à faire port
