NEW YORK—The 10 largest retailers’ share of the Top 50 for 2014 changed little at an estimated 86.1 percent, compared to an estimated 85.5 percent in 2013.

Similarly, the mass merchants’ share of the Top 50’s estimated U.S. optical sales for 2014 remained stable at an estimated 25.5 percent compared to an estimated 25.7 percent in 2013. However, the total estimated sales for the mass merchandising chains and warehouse clubs increased by an estimated 5.6 percent from an estimated $2,665.7 million for calendar year 2013 to an estimated $2,814.3 in 2014.