Method for altering the visual performance of a subject, method for measuring the spherical refraction correction need of a subject and optical system for implementing these methods
An optical system and subject technology, applied in the direction of retinal mirror, comprehensive refractometer, eye testing equipment, etc., to achieve the effect of reducing the number of tests and high precision
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[0369] In the first embodiment:
[0370] - When measured visual acuity is less than 2 / 10, set an intermediate visual acuity target of 4 / 10, corresponding to the first step towards the final visual acuity target. The corresponding degree of defocus is determined and applied using the previously mentioned formula Eq. Display optometry font size corresponding to visual acuity 4 / 10;
[0371] - When the measured visual acuity is greater than 2 / 10 and less than 4 / 10, an intermediate visual acuity target of 5 / 10 is set, corresponding to the first step towards the final visual acuity target. The corresponding degree of defocus is determined and applied using the previously mentioned formula Eq. Display optometry font size corresponding to visual acuity 5 / 10;
[0372] - When the measured visual acuity is greater than 4 / 10 and less than 8 / 10, the visual acuity target is referred to as the final visual acuity target. The corresponding degree of defocus is determined and applied using...
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