Table 6. Patient self-perceived visual function.

Study	Outcome	Measurement instrument	Estimation result	P-value#
Hoffman et al16	Change in annual attributes mean scores	VAQ	Scores by attribute for placebo vs DHA comparison at year 4 Colour 2.27±1.37 vs 2.26±1.22 Brightness 3.10±1.45 vs 3.07±1.12 Light-dark adaptation 3.19±1.26 vs 3.46±1.16 Acuity/spatial vision 2.83±1.39 vs 2.96±1.13 Depth perception 1.98±1.31 vs 2.00±1.00 Peripheral vision 2.63±1.13 vs 2.87±1.10 Visual search 2.61±1.28 vs 2.69±0.97 visual processing 2.28±1.23 vs 2.22±0.92	>0.40
Lee et al18	Change in scores	VF-14	Not reported	ns (P-value not reported)

Abbreviations: DHA, docosahexaenoic acid; ns, no significant; VAQ, visual activities questionnaire.

VAQ based on eight attributes; VF-14, visual function 14, based on 14 questions related to self-perceived quality of life. ^#Difference between groups/periods.