The Analysis Of Factors Influencing The Effectiveness Of Cataract Phacoemulsification In Canine

Cataract is opacity of the lens or the capsule. It is one of the leading causes of vision loss in canine. The affected canine may run into obstacles, disability on physical exercise, fail to eat regular food, place ever greater burdens on the owners. At the moment, phacoemulsification is the most effective treatment for dogs with cataract. It uses the probe inserted through the small incisions, which transmits ultrasound waves to emulsify the cataract and suction out the fragments. To achieve excellent surgical effect, light rays should reach the back of the eye, and retina functions should not be destroyed after surgery. Maturity of the cataract, phaco parameters and other reasons can cause different postoperative complications, which will prevent the light rays from entering the back of the eyes, cause distruction of retina functions and influence postoperative outcomes. This study tries to definite the influence of above factors on the effect of phacoemulsification by analysis of it in clinical practice in canine, and put forward precautions of cataract surgery and reduce the incidence of adverse effect.The research carries out ophthalmology checks, including schirmer tear test readings, pupillary light reflexes( PLR), palpebral reflex, menace response, dazzle reflex, ophthalmic dyes, intraocular pressure measurement, slit-lamp examination, ophthalmoscopy, tracking responses, maze testing and ocular ultrasonography. Classification by cataract maturity and eliminating surgery contraindications should be performed before the surgery. Two different phaco parameters were set up during the surgery. The visual acuity and complications were recorded after surgery. The influence of cataract maturity, phaco parameters and postoperative complications on canine cataract phacoemulsification can ben obtained through these methods. The results are as follows:1. 10 cases of dogs was diagnosed with cataract. The poodle were 40%, Shih tzus was 10%, Hybrid dogs was 10%, Ancient shepherd was 10%, schnauzer was 10%, bear dogs was 10%, the Pomeranian was 10%. 60% of them was female, and 40% was male. 80% was small dogs, 20% was medium-sized dogs. Adult dogs was 70%, olderly dogs was 30%.2. 4 of the 11 eyes with catarat were immature, 4 eyes were mature and 3 eyes were hypermature. Immature cataract visual lose ratio was 0, mature cataract visual loss ratio was 25%, hypermature cataract visual loss ratio reached 33.3%.3. Fibrin exudation rate was 33.3% with high phaco parameters postoperative, while 0 with low phaco parameters.4. The complications of cataract including fibrin effusion, iris adhesion, posterior capsular opacity, retinal detachment and glaucoma. The eyes with retinal detachment or glaucoma lost eyesight.Comprehensive analysis of the above test results shows that: cataract happens more in poodle, the incidence of small dogs is more than large dogs, and adult female dog has a higher prevalence of cataract. The higher the cataract maturity, the higher the incidence of postoperative complications, the greater the risk of loss of vision after surgery, the poorer the surgical effect. When high phaco parameters is applied, intraocular inflammation is heavier. Different complications can result in reduction of operation effect or vision loss. Attention should be pay to glaucoma and postoperative retinal detachment to prevent blindness.