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There is another kind of slit lamp eyepiece adaptor,please see as below link:

http://www.jhoptical.com/BL-600.html

Features:

* The economic imaging solution by smart phone makes you to share the image you took in the convenient way.

* This adaptor work for smart phone in size from: 0.4 inch ~ 5.5 inch (98mm ~134mm)

* Eyepiece in size from: 1.0 inch ~ 1.8 inch (25mm ~ 45mm)

* Silicon ring for small eyepiece

* Easy installation without removing the eyepiece of slit lamp

* User-friendly design available for different smart phone camera position

* This adaptor also available work for operation microscope, telescope, binoculars, biologic microscope

Below pictures took from S350s slit lamp with iphone5s