Table 3. Eye status, age and sex of the eight humans (F: females; M: males) included in the study.

Name	Sex	Age (years)	Eyeglasses/contact lenses
F1	Female	33	Yes (short-sighted)
F2	Female	24	No
F3	Female	35	No (slight astigmatism)
F4	Female	23	Yes (long-sighted)
F5*	Female	24	No
M1	Male	23	No
M2	Male	29	No
M3	Male	49	No

*Excluded from final analysis because of poor performance in tests (see text).