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In short term visual memory training you see several letters in front of you for a second, and then you need to count the number of occurrences of each letter. The more letter of more types you need to count over a larger area, the harder the exercise. You can choose which part you want to work on (saccade size, capacity of memory, accuracy of memory). A normal superlearner should be able to read a flash of 9 letters of 3 types over saccade of 400.
Do not count the letters from the screen: form a mental image of the screen and count the letters from the mental image. Practice for 10 min per day and after several months, you will have better photographic memory.