Functional vision examination comprises of continuous functional visual acuity,intraocular straylight,wavefront aberration,point spread function,modulation transfer function,contrast sensitivity,glare sensitivity,binocular visual function,etc.Functional vision examination is a comprehensive and useful tool,which is widely used in evaluating cataract patients whose visual acuity is good at early stage but objective quality of vision is bad,also in evaluating whether the patients could not only see but also see clearly and comfortably after refractive and presbyopia-correcting cataract surgery.