Huanyu Optical Retinoscope Schematic Model Eye Practice Metal Model Eye Teaching Practice Eye Coordinate with the retinoscope practice,Simulate real eye There is scale on the lens-barrel which represents different ametropia (-5.00D to +4.00D) 3 levels of difficulty with change in the pupil size (3, 5, 7mm) ,Switchable by simulation of small, general and mydriatic pupil. 3 layers of arc walls for refraction lenses or setting of different degrees of astigmatism and axial cylinder. Degree of astigmatism axial angle disk: 0~180 degree The retinal picture color is real good, and the size marching the focus, similar with the human eye. Retinal picture and the diopter power adjust range is 9D. Error of the diopter within 0. 25D. Pupile hole there are three size DIA 3, DIA 5. DIA 7. Small pupile,normall pupile and mydriatic. Rotating the handle can change the pupile. On the front of the drawtube, can place three pcs of trial lens or the cylinder lens and the axis. The Axis from 0-180 degree. Each one line is 5 degree. Can place on different height to training as per the trainor&#039;s height Mainly applicable for exercise use for retinoscopy beginners. Used for optometry practicing: Hyperopia/ Myopia/ Astigmatism retinoscopy