Table 1.

Italian classification of visual impairments—law no. 138/2001.

	Category	Definition
1.	Totally blind	Total loss of vision in both eyes or mere perception of shadow and light or hand motion in both eyes or the better eye or binocular residual perimeter less than 3%.
2.	Partially blind	Residual vision not exceeding 1/20 in both eyes or the better eye, even with correction or residual binocular perimeter less than 10%.
3.	Severe visual impairment	Residual vision not exceeding 1/10 in both eyes or the better eye, even with correction or residual binocular perimeter less than 30%.
4.	Moderate visual impairment	Residual vision not exceeding 2/10 in both eyes or in the better eye, even with a possible correction or residual binocular perimeter less than 50%.
5.	Mild visual impairment	Residual vision not exceeding 3/10 in both eyes or the better eye, even with a possible correction or residual binocular perimeter of less than 60%.