Features 1Adopting high quality material, which is durable and also environmental friendly 2There is scale on the lens-barrel which represents different ametropia 33 levels of difficulty with change in the pupil size, switchable by simulation of small, general and mydriatic pupil 43 layers of arc-shaped walls for refraction lenses or setting of different degrees of astigmatism 5Simulated design is more convenient to practice optometry, easy and flexible to operate Specification This product is a retinoscope training eye. Adopting high quality material, which is durable and also environmental friendly. There is scale on the lens-barrel which represent different ametropia. Simulated design is more convenient to practice optometry. Features: Adopting high quality material, which is durable and also environmental friendly. There is scale on the lens-barrel which represents different ametropia. 3 levels of difficulty with change in the pupil size, switchable by simulation of small, general and mydriatic pupil. 3 layers of arc-shaped walls for refraction lenses or setting of different degrees of astigmatism. Simulated design is more convenient to practice optometry, easy and flexible to operate. Specifications: Condition: 100 percent New Item Type: Model Eye Material: Plastic Color: Black Function: For optometry practicing Quantity: 1PC Package Weight: Approx. 489g Package Include: 1 x Retinoscope Training Eye