Table 2.

Participant characteristics, unflanked performance levels, and stimulus sizes tested.

Subject	Habitual spherical correction	Sizes tested with AO (arcmin. of one stroke; 1/5 of letter size)	Estimated 75% Acuity w/AO	Sizes tested w/o AO (arcmin. of one stroke)	Estimated 75% Acuity w/o AO
S1	4.5D	0.61, 0.73	20/11 (0.55′ MAR)	0.85, 0.97	20/15 (0.75′ MAR)
S2	—	0.37, 0.42, 0.47, 0.53, 0.58	20/8 (0.4′ MAR)	0.63, 0.69, 0.79	20/12.5 (0.625′ MAR)
S3	1.5D	0.53, 0.58, 0.63, 0.69	20/12 (0.6′ MAR)	0.63, 0.69, 0.74, 0.79	20/12.5 (0.625′ MAR)

S2 is an emmetrope.