Description: brand new and high quality Features: Standard retina has accurate color reproduction with the corresponding physical dimension focal length ratio. Ametropia (-a + 4.00D 5.00D), you can put any power on it to train by inculding the lens cylinder. 3 difficulty levels with change in pupil size (3, 5, 7mm), switchable by small, general and mydriatic simulation. 3 layers of walls for arc refraction lenses or definition of different degrees of astigmatism and axial cylinder. Degree of axial astigmatism disc angle is 0 ~ 180 , Flexible support with height adjustment. Eye refraction checker only, other accessories demo in the picture is not included! Specification: Type: Eye Refraction Checker Material: Optical lenses, Metals, Plastics Diopter adjustment range: 9.00D Pupil diaphragm:3, 5, 7 Applications: Refractive examination, eye test, practice Features: Refractive examination, eye refraction check, beginner, practice, recommended adjustment, easy to operate Dimension: app.13.5x7.5cm/5.31x2.95in Color: Black Quantity: 1 Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc x Eye Refraction Checker