Greetings, Michael, I assume a person cannot suffer from CBS unless they have had useable sight, else, how can they know anything about seeing or colour? I assume, therefore, at one time, you must have had at least more than light-and-dark perception? I suggest, take this onto the ViGenAccess group, where it is probably more appropriate. In case you are unaware of the group let alone how to join, send the usual blank email to: vi-genaccess-subscribe@xxxxxxxxxxxxxxx ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq