Plastic Lens holder + Metal Base.
Retina pattern has accurate colour rendition with the physical dimension matching focal length ratio
Ametropia (-5.00D to +4.00D) ,You can put any power on it to train,inculding the cylinder lens .
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 is 0~180°
Flexible stand with height adjustment