Retinoscopy
Retinoscopy (also called skiascopy) is a technique to objectively determine the refractive error of the eye (farsighted, nearsighted, astigmatism) and the need for glasses.
Retinoscopy2
Retinoscopy (also called skiascopy) is a technique to objectively determine the refractive error of the eye (farsighted, nearsighted, astigmatism) and the need for glasses.
Spatial Distance Frequency Relation
Spatial frequency is the frequency of change per unit distance across an image. Some images have high spatial frequencies, whereas other ones have low spatial frequency.
Spatial Frequency
Spatial frequency describes the rate that a stimulus changes across space.
Nystagmus
Nystagmus is not always related to an underlying condition. It may be caused by:Congenital that is passed from parents、Disorientation (such as on amusement rides)、Induced by alcohol or drug use、Medication such as drugs for seizures、Head injures.
