Complex sentence: There is no equivalent in stereoacuity of the normal 20/20 visual acuity standard and in any case, the numerical score, even if expressed in disparity angle, depends to some extent on the test being used.
Split into simpler sentences: There is no equivalent in stereoacuity of the normal 20/20 visual acuity standard. In every case, the numerical score, even if expressed in disparity angle, depends to some extent on the test being used.