Ruth,
I've used Both types,
Optic has many test/examinations on the piece of equipment compared to the Keystone. But if you only using for near/far middle etc. Then Keystone is easier.
Hope this is useful.
Heather Wawryka.
TWI Ltd, Granta Park, Cambs
Sent from my iPad
> On 24 Sep 2015, at 09:19, Ruth Hazell <[log in to unmask]> wrote:
>
> Hi All,
>
> In the process of purchasing a new vision screener for our mobile unit. Has anyone had any experience with either or both of these vision screeners as I am interested to know which one people prefer.
>
> Many Thanks in advance for your input!
>
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