glasses can be worn over regular glasses. The arm length is adjustable between 9cm and 11.4cm The soft plastic construction is durable and lightweight for stress-free wearing for extended periods of time, ensuring maximum comfort. 【Humanized design】There are 2 holes at the ends of the arm that can pass through the rope to facilitate hanging around the neck or on the wall. 【Reduce Eye Pressure】If you experience eye strain from bright or flashing lasers' beams, wearing eyeglasses can help relieve the pressure on your eyes. 【Adjustable Frame 】Arm length is adjustable in four positions between 9cm and 11.4cm. The side and nose sections are adjustable for a perfect fit without slipping and a comfortable fit that can be worn over regular glasses. 【Improved Laser Visibility】When the lasers' beam is dim, this kind of safety glasses can improve the visibility of the green lasers' line or green lasers' dot to some extent. Please note: Lasers' glasses can only improve visibility and cannot provide protection.