This excerpt taken from the EYE DEF 14A filed Apr 25, 2008.
X. TERMINATION OF EMPLOYMENT
Bonuses, if any, for Participants who become eligible after the beginning of a Plan year, retire (defined as age 55 or over with at least 5 years of service), become disabled, die or transfer into a position covered by another incentive plan will be prorated. Bonuses, if any, for Participants who are laid-off will be prorated provided the Participant was eligible for at least six months of the Plan year. All proration will be based on the number of months of participation in the Plan during the Plan year.