What is a Retinoscopy?

Retinoscopy (retinoscopy, skiascopy) is an objective optometry method. It was discovered by accident in 1859 by William. He examined his astigmatism with ophthalmoscope and found a special reflection. It was not used in clinical practice by Cuignet until 1873. In 1884 Smith suggested the use of the term shadow test. The term retinoscopy was coined by Parent in 1881.

Retinoscopy

When we take a photo one meter away from the subject, such as:

Shadow motion is reverse, the preliminary judgment is-1.00DS above myopia, plus negative ball to neutralize to determine the specific

Classification of radiography: 1, monocular microscopy 2. Cylindrical microscopy 1. Monocular microscopy technique: a distance of 0.5 meters a, inverse (negative vision above -2.00) neutralization with negative ball b, The immobile (-2.00 myopia) is also the neutral point, which shows that the shadow does not move. It is nearer and more distant. The color of the reflective point at the neutral point is more red. The color is bright light yellow, and the distance of some retro-reflection shadows will soon be bright yellow. C, smooth motion (myopia, orthopia, and farsightedness below -2.00) neutralize with positive lens 2. Inspection with column lens: 0.5 m distance a. Do not move in one direction, and reverse the light belt perpendicular to the direction: first add a negative ball to neutralize the reverse movement, and then leave the light belt to move in the vertical direction and observe the position of the light belt (axial position), according to Speed of the moving light belt, light and dark plus positive column lens resolution b, moving in one direction, and moving the light belt perpendicular to it: observe the position of the light belt (axial position), according to the speed of the moving light belt, Bright and dark plus positive column lens to dissolve c, both directions are reversed: make sure that both directions are reversed, observe the position of the two light bands (axial position) Observe that the two light bands move light (fast) and dark (slow). Add a negative ball lens to first eliminate the dark and slow moving light bands, and then dissolve the remaining light bands that move in the vertical direction and observe the light bands. Position (axial position), according to the moving speed of the moving light band, light and dark plus positive column lens d, smoothing in both directions: Make sure that both directions move smoothly, observe the position of the two light belts (axial position), observe The two light bands move bright (fast) and dark (slow). Adding a sphere lens first dissolves the bright and bright light bands, and then dissolves the remaining light bands that move in the vertical direction and observe the position of the light bands. (Axial position), according to the moving speed of the moving light belt, the light and darkness plus the positive column lens to dissolve e, one direction reverse movement, one direction smooth movement: determine one direction reverse movement, one direction smooth movement, observe the position of the two light belt (Axial position), add negative ball to dissolve the inverse moving light band first, and then dissolve the remaining vertical moving light band and observe the position of the light band (axial position), according to the moving speed of the moving light band, Bright and dark plus cylindrical lens resolution