Table 1. Summary of results from Oxford patients in the Alpha-IMS trial.

	Light perception	Light localisation	Grating acuity (cpd)	Grey levels seen	Reading clock time	Daily life experiences
1	+	−	−	3	−	Little
2	+	+	0.33	5	−	Useful
3	+	−	0.33	4	−	Useful
4	+	+	1	4	−	Useful
5	+	+	0.33	4	+	Little
6	+	+	1	6	+	Useful

Full results of the multicentre trial can be found elsewhere.¹⁰ A typical setup for testing patients can be seen in Figure 4. To avoid any effects of guessing, subjects were tested several times without knowing if the device was switched on or off.