Stop and start the vision simulator as appropriate using the table below to see how your vision will improve rapidly after just a few nights wear.
An moderate prescription of -3 is below -1 after just one night and -0.3 after a week - well below the approximate legal driving level.
On average 70% prescription improvement is achieved in one night, 90% in one week and the remaining 10% can take up to a month or so. However even the highest prescriptions reach -1 after one night and 0.5 after a week - which is considered good functional vision.