Methods: the trial consists in a series of neuropsychological tests involving both subject of the study and a close parent one-month before and three months after surgery of the most affected eye. Each patient is under investigation during 4+/1 months. The tests used are the MMS (Mini Mental Status), ADAS-cog Alzheimer Disease Assessment Scale for cognitive functions, NPI (Neuropsychiatric Inventory) for behavior troubles, IADL (Instrumental Activities of Daily) for autonomy evaluation, GDS (Geriatric Depression Scale) or Cornell Scale (Cornell Scale for Depression in Dementia) for mood troubles. All data are registered along as well as medical treatments and severe side effects.