| 摘要 |
FIELD: personal items; optical system.SUBSTANCE: invention relates to eyeglasses and can be used for users with unusual dimensions of head. Glasses have arch extending backward from front side and comprising a flexible part, characterised by radius of curvature ρ and including first and second lengthwise ribs. When arc is not in bent state, first rib is located at an angle to second rib ρ < 80 mm.EFFECT: optimum combination of reliability of seating and wearing comfort for a wide range of dimensions of user's head.20 cl, 11 dwg, 2 tbl |
