blink between two slides

[M B]

Hello All,
I have a task that I measure visual acuity. When I used black
background for fixation and the stimulus I did not experience the
blink between the stimulus and fixation representations. However, I
need to use white background for my new experiment and I experience a
blink between these two slides ( a momentary gray blink). I was
wondering whether any of you had a similar issue and know the way to
prevent this issue.
Thanks.

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