Contrast ratio controlled by user on all charts. Wide range of optotypes of HD Display. Best for paediatric and all type of complicated refractive error testing.
![](http://vehrc.com/wp-content/uploads/2022/02/I-chart-HD-Appasamy.png)
Contrast ratio controlled by user on all charts. Wide range of optotypes of HD Display. Best for paediatric and all type of complicated refractive error testing.