L	lutein
Z	zeaxanthin
MPOD	macular pigment optical density
MZ	meso-zeaxanthin
CNS	central nervous system
MP	macular pigment
HPLC	high-performance liquid chromatography
FFQ	food frequency questionnaire
RCI	reliable change index
VeM	verbal memory
ViM	visual memory
R	reasoning
EF	executive function
PmS	psychomotor speed
CA	complex attention
CF	cognitive flexibility
NVRT	non-verbal reasoning test
SAT	shifting attention test
FTT	finger tapping test
SDC	symbol-digit coding
ST	Stroop test
CPT	continuous performance task