Surgical methods and related medical devices for treating glaucoma are disclosed. The light module includes a first printed circuit board, a second printed circuit board, a light source, and a fixing casing, wherein the first printed circuit board and the second printed circuit board each has a fixing part, and the fixing part of the second printed board is attached to the fixing part of the first printed board. The second transistor has a control terminal connected to the input terminal, a first terminal connected to the output terminal, and a second terminal connected to a first power source. The wholly aromatic liquid crystalline polyester has sum of an amount of terminal hydroxyl group and an amount of terminal acetyl group in a range of 50 to 350 equivalents, and has a ratio + of the sum of the amount of terminal hydroxyl group and the amount of terminal acetyl group to an amount of terminal carboxyl group in a range of 1. In addition, the system can provide recommendations to the speaker as to how improve understandability.