The non-randomized controlled study on the application of the laser iridoplasty to the acute angle-closure glaucoma during variable phase

INTERVENTION: Operation group after decreasing intraocular press:Laser iridoplasty after decreasing intraocular pressure, following drug therapy in acute phase;Operation group in acute phase:Laser iridoplasty at acute phase to decrease intraocular pressure; CONDITION: acute angle‐closure glaucoma PRIMARY OUTCOME: The achievement ratio of controlling intraocular pressure;The range of goniosynechia; SECONDARY OUTCOME: The rate of trabeculectomy;intraocular pressure; INCLUSION CRITERIA: 1. The timing of acute reduction of visual acuity can be specified; 2. Increased intraocular pressure=40mmHg; 3. Age=40 years old; 4. Shallow anterior chamber; 5. Having one of the following signs: ciliary congestion or mixed congestion, corneal edema, segmental atrophy of the iris, moderate mydriasis, deformed and fixed pupils, glaucomatous fleck of the lens; 6. Having one of the following symptoms, complicating with increased intraocular tension: Headache or ophthalmalgia, eye distension, nausea, vomiting.