Typically saccade amplitude by difference in time between two fixation points should give the saccade velocity if the sampling frequency of the eyetracker was higher than 330 Hz. But for a Tobii 60 Hz eye tracker how to estimate saccade velocity especially for short TOI?
I think that in general, you can still calculate saccade velocity, the only problem is that you will miss higher amplitudes and get lower precision..So if you already have data, I would perform analysis anyway, if your hypothesis allows it, you can even find differences between sacc. velocity and variables of your interest, especially if you look at more distant saccades... and just mention that in your limits.
You can also always use interpolation for low sampling frequency in physiological signals. We used method from this paper a few years earlier:
Wierts, R., Janssen, M. J. A., & Kingma, H. (2008). Measuring saccade peak velocity using a low-frequency sampling rate of 50 Hz. IEEE Transactions on Bio-Medical Engineering, 55(12), 2840–2842. https://doi.org/10.1109/TBME.2008.925290
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