HOPATCONG BOROUGH – Police are seeking the public’s assistance in searching for a Roxbury optometrist who disappeared Friday, possibly after entering Lake Hopatcong for a night swim.

The man, Arthur Clarke, 64, was last seen at around 8:30 p.m. on May 19 when he left home near Byram Cove to go for a swim in the lake, said Hopatcong Borough Police Lt. Thomas Kmetz. Going for a night swim, even in chilly water, “is not unusual for Mr. Clarke,” said the lieutenant in a statement. “He is an avid swimmer who swims in cold months as well as near nightfall.”

Kmetz said Clarke, who operates Hopatcong Eye Care in Landing, was last seen by his mother who went to sleep and didn’t notice her son was missing until she awoke early Saturday.

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“A neighbor was contacted who found Mr. Clarke’s flip flops and shirt on the dock of the Clarkes’ lakefront home,” Kmetz said. “His personal belongings were home as well as his bicycle and vehicle.”

He said the state police marine bureau has been searching Lake Hopatcong.

“We are hoping for the best,” Kmetz commented. He asked anybody with information to call Hopatcong police at (973) 398-5000.

Clarke was a Hopatcong teacher and "is well-known in our community,” Kmetz said. “Family members are with his elderly mother.  We are asking if you know the family, that you do not contact the family. His elderly mother is not in the best of health.”