Prism Testing


Prisms bend light, changing the object’s position. Because of this property, they are commonly used to detect and measure strabismus (turned or crossed eye). While the patient is staring at an object, prisms of increasing strength are placed over the turned eye until it is aligned with the fellow eye. The stronger the prism that is required to align the eyes, the greater the eye turn.







St. Luke's Cataract & Laser Institute provides this on-line information for educational and communication purposes only and it should not be construed as personal medical advice.  Information published on this St. Luke's website is not intended to replace, supplant, or augment a consultation with an eye care professional regarding the viewer/user's own medical care.  St. Luke's disclaims any and all liability for injury or other damages that could result from use of the information obtained from this site.

back to top