Under normal Book cover wholesale circumstances the total reflection to the retina, allowing cone cells [1], the pupil of the human eye because the regulation as blocked, causing the weakest sense of color vision, resulting in the most dollars. The following Book cover wholesale describes the reasons cause visual fatigue and the color Book cover wholesale of the colored paper used for a range of optical radiation can sense the light intensity of the entire frequency, so that the eyes are tired of visual fatigue.

At the same time, introduced to, but a certain amount of Book cover wholesale radiation to the status. Because color vision function is suppressed, some colored paper the latest research results, to be the Book cover wholesale heart and produce adverse health resulting visual reduction, people will instinctively read books in closer, so eyes are full-frequency light more strong stimulus, but also forced Book cover wholesale ciliary muscle in contraction, eye fatigue, so that the axial extension form functional regulation myopia. And because the high concentration of attention blink would greatly reduce the secretion of tears may also decrease the cornea dry eye pain caused by congestion and other eye Book cover wholesale diseases.

The color of colored paper Book covers wholesale on the visual impact of fatigue

2.1 Book cover wholesale yellow paper

Buben with a yellow and white writing each successive 2h, Book cover wholesale were recorded before and after writing nearly every adjustment of the eye point, high, medium and low contrast visual acuity, contrast threshold changes. Under the same conditions, Book cover wholesale the comparison can be decreased visual acuity, contrast threshold increases, but due to the high contrast white Buben and more severe vision loss in contrast, Book cover wholesale contrast threshold value increases more significantly.