The adjustment of the crystalline lens is made by mechanical stress on the flexible lens, which is similar to the action of the ciliary muscles.
This innovative functional eye model is an open design model, offering high visibility, which does not involve the injection of liquid.
The screen represents the retina that can slide along the optical axis to simulate vision problems (myopia, hyperopia).
It is composed of a flexible lens with an adjustable focal length, which constitutes the crystalline lens for comprehensive visualisation.  
The lens holder is placed in front of the eye to allow a corrective lens to be put in place.
The crystalline lens is equipped with an adjustable focal, without the need for further injection of a liquid*, which enables the study of vision problems and their correction. Contents: eye model and a kit of corrective lenses.
a one-time injection of liquid is required when setting up the apparatus for the first time only. 

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Ltekonline are the manufacturers of Functional Eye Model Non-Liquid Biology Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Biology Laboratory Equipment for Engineering Teaching Lab in Universities