EMPLOYEE HAD LEANED LADDER AGAINST SOLID WALL TO SEE IF BOXES ON SHED ROOF COULD BE EASILY IDENTIFIED. WHEN COMING BACK DOWN LADDER, EMPLOYEE STATED HE MISSED THE FIRST STEP. WHILE GRABBING TO STEADY HIMSELF IT APPEARS THAT ONE INSRUMENT AND ONE PARTIAL BAG OF PIGMENT NEAR DISLODGED. EMPLOYEE APPEARED TO HIT ON RIGHT SIDE, RIGHT EYEGLASS ARM WAS BENT/LENS SCRATCHED. EE FELL 4'- 5'.