Shakespeare's Sonnets: Since I left you, mine eye is in my mind

Since I left you, mine eye is in my mind,And that which governs me to go aboutDoth part his function and is partly blind,Seems seeing, but effectually is out,For it no form delivers to the heartOf bird, of flow'r, or shape which it doth hatch,Of his quick objects hath the mind no part,Nor his own vision holds what it doth catch:For if it see the rud'st or gentlest sight,The most sweet favour or deformèd'st creature,The mountain, or the sea, the day, or night,The crow, or dove, it shapes them to your feature. Incapable of more, replete with you, My most true mind thus maketh mine untrue.