SIVASHANKAR RYAMINI THAKURTANUVASRAMANI CSABIHA HAYATH BASHA2024-01-122024-01-122021https://krishikosh.egranth.ac.in/handle/1/5810206234A well-dilated pupil enhances the ease of cataract extraction, reduces time and decreases the likelihood of complications. Pharmacological treatment with Adrenaline is rapid and effective method to achieve sufficient pupil dilation but it may be ineffective in some cases. Pupil expansion device represent a more effective option for maintaining mydriasis as well as protecting the pupillary margins. The study was conducted on clinical cases with canine cataract presented to Small Animal Ophthalmology unit of Madras Veterinary College Teaching Hospital. They were subjected to detailed clinical and ophthalmic examinations for diagnosis of cataract. After detailed ophthalmic examination and ocular imaging, the twelve canine cataract cases were divided into two groups viz., Group I and II. In Group I, pharmacological treatment (intracameral adrenaline) was used whereas in Group II, pupil expansion device (iris retractors) was used for achieving sufficient pupillary mydriasis. Under general anaesthesia, pupillary mydriasis was achieved with intracameral adrenaline prior to phacoemulsification procedure in Group I. In Group II, self-sealing stab incisions were made at 3, 6, 9, 12 O’ clock position and iris retractors were engaged to the pupillary margin. Iris retractors were typically used in sets of four to create a quadrangular pupil. Careful arrangement of the retractors optimized visualization and prevented the interference with surgical instruments and manoeuvres during phacoemulsificationEnglishThesis