Because the refractive index of the same medium is different for various monochromatic lights, the deflection angle of each monochromatic light passing through the prism is also different. So white light passing through the prism will separate each monochromatic light, that is, dispersion.
Objective To explore the clinical application scope and curative effect of pressing prism. Methods The film prism with corresponding degree was pressed on the frame lens to correct and relieve the mild strabismus, homophobia and undercorrection after strabismus correction.