Computerized refraction prescription determination with sphere calculation

A method for determining a corrective lenses prescription for a person comprising, separately, for each eye of the person:

• determining a distance of the person from a computerized screen;
• and
• determining a sphere prescription for the person via the computerized screen and without the use of a refractor lens assembly,
• wherein determining the sphere prescription for the person comprises testing for the sphere prescription by:
• displaying a sphere figure to the person via the computerized screen and enabling the person to select at least one multiple choice input, and
• using the at least one multiple choice input in connection with the determined distance of the person from the computerized screen to determine a sphere measurement that is used to determine the sphere prescription of the corrective lenses prescription for the person.

A non-transitory computer readable medium including a plurality of instructions, which when executed by at least one processor, cause the at least one processor to operate with at least one display device and at least one input device to determine a corrective lenses prescription for a person comprising, for each eye of the person:

• determining a distance of the person from a computerized screen;
• and
• determining, without the use of a refractor lens assembly, a sphere prescription for the person by,
• (i) presenting a first sphere figure to the person via the computerized screen, wherein the first sphere figure is too small to be clearly seen by the person,
• (ii) enabling the person to make at least one input to increase the size of the first sphere figure until it can just barely be made out by the person, wherein the determined distance of the person from the computerized screen is used in conjunction with the at least one input to calculate a first sphere measurement,
• (iii) presenting a second sphere figure to the person via the computerized screen, wherein the second sphere figure is large enough to be clearly seen by the person, and
• (iv) enabling the person to make at least one input to decrease the size of the second sphere figure just until it can no longer be made out by the person, wherein the determined distance of the person from the computerized screen is used in conjunction with the at least one input to calculate a second sphere measurement;
• wherein a final sphere measurement is based, at least in part, on the first sphere measurement and the second sphere measurement.