Black and white column image MEDICAL PURPOSE

Hello gurus,

I need to create a video that will be used for medical purposes ( orthoptist visit ). The patient should look at a full screen video that shows black and white columns sliding to the right. There will be 10 different videos and each one will have a different column width , hence different column numbers ( from greater to smaller ) and theorically at a certain column width , the patient shouldn't be able to distinguish the black and white columns and he should see all grey.

What I want to do is create the .tif image with matlab and then with Adobe Premiere make the video. (If you have any other idea you're more then welcomed )

I'm struggling in creating the image because the smallest column width is 0,192 mm and I don t know how can i defien the exact column width.

This is what i did ( matrix.xlsx is an excel file with 1 and 0 )

   filename = 'matrix.xlsx';
  sheet = 1;
  xlRange = 'A1:sf500';

A = xlsread(filename, sheet, xlRange)

imwrite(A , 'matrix.tif' , 'tif')

but it doesn't allow me to set the column width but just the number of columns and no matter how big my matrix is (500x500 or 5000x5000) I always get the same height.

The result of the code is

My laptop resolution is 1920x1080 ( FHD ) and my screen width is 34,5 cm ( it s a 15,6" screen). So my pixel size is 34,5/1920 = 0,01796 cm which is 0,1796 mm.