Home Forums Eye Tracking Devices Visual angles measurement


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    Rasa Bhattarai

    Hello Tobii team,

    I also want to know how to do this. If I have an initial position of (200, 150) given by my Tobii Eye X as (x,y) co-ordinates of the screen, then at what place should my next (x,y)co-ordinate be so that i can calculate the visual angle to be 2, 3 or 1.5 degrees.

    Would you please explain ? Also, may I know the formula how to achieve this? I looked around in many sites but I am still confused in calculating the visual angle.

    Thank you very much

    Alex [Tobii]


    Tobii Unity SDK doesn’t provide such information. Could you please elaborate? What do you need it for?

    Grant [Tobii]

    Hi rasa, you should also consider that there will not be just one new position dependent on the angle difference.

    For example, suppose you have the starting position @ (200,200) and you wish to move 2 Degrees. There would therefore be a *circle* of points around which 2 degrees would be possible, thus making your original request much more complicated.

    In any event, If you could kindly clarify your intentions perhaps we can find a simpler solution for you.

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