Table 1.

Time schedule

At least 30 minutes	↓	2 minutes	↓	10 minutes	↓
Resting period	Fundus pulsation measurement	Baseline measurements with LDF in the macula	Start of carbogen breathing	LDF measurement in the macula during breathing of carbogen	Fundus pulsation measurement
Resting period		Baseline measurements with LDF in the optic nerve head		LDF measurement in the optic nerve head during breathing of carbogen
Resting period		Baseline measurements with the Zeiss retinal vessel analyser		Retinal vessel diameter measurement during breathing of carbogen