place and the emitted retinoscopic light is focused onto a wall by moving the retinoscope towards the wall until the streak is in focus 16 finally the distance between the wall and retinoscope is measured to obtain the examiner 39 s retinoscopic working distance 17 with reference to fig6 a calibration chart 18 is shown the calibration chart 18 lists the retinoscopic working distance in centimeters 19 and the required power of the calibration lens to be held in front of the retinoscope which is held from a wall a distance equal to the examiner 39 s retinoscopic working distance 19 in order to calibrated the diverging retinoscopic light for an infinity endpoint 20 and a 0 50 d endpoint 21 chart 18 also lists the distance a retinoscope must be held from a wall to calibrated the retinoscope using converging light for a 0 50 d endpoint 22 and a 0 75 d endpoint 23 when performing retinoscopy from one 39 s retinoscopic working distance with reference to fig7 a an attachable plate 24 for retrofitting a retinoscope 1 when calibrated for a 0 50 d with motion endpoint pupillary reflex using converging rays 14 emitted from the retinoscope 1 is shown the plate 24 shown here is a 0 50 d converging plate 25 and is used when the converging light emanating from the retinoscopies is calibrated for a 0 50 d with motion retinoscopic endpoint as shown further in fig8 the 0 50 d converging plate 25 has a front surface 26 a rear surface 27 and an alignment line 28 the plate 24 is attachable to the retinoscope via an attachment means 29 such.