rimless       
adjective uk/ˈrɪm.ləs/ us/ˈrɪm.ləs/
 无框的
Rimless glasses do not have a rim (= an outer edge made from a different material).
  He's got new rimless reading glasses. 他配了新的无框老花镜。 
 rimless spectacles
 See: rim
 - More examples
 - His eyes were concealed by thick, rimless spectacles.
 - She was dressed in a sleeveless black waistcoat and rimless sunglasses.
 - They both wear rimless glasses that melt into the face.