Natthanet Sritrakoon(1), Winyu Karntip(1), Sirirat Niyom(2), Susadee Khemton(3), Panuwat Pakpiboon(3), Kant Wongsirodkul(3), Kanyarat Arunsri(1) and Aree Thayananuphat(2*)
1- Ophthalmology Unit, Kasetsart University Veterinary Teaching Hospital, Bangkok, 10900, Thailand
2- Department of Companion Animal Clinical Sciences, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, 10900, Thailand
3- Veterinary Department, Safari World, Bangkok, 10510, Thailand
Background: Cataracts are the major cause of visual impairment in animals which can be curable by surgical treatment. Phacoemulsification is the standard technique for cataract treatment that is applied to almost all species with a high success rate.
Case Description: A two-year-old intact female orangutan (Pongo pygmaeus) was presented for the study having bilateral opacity of the lenses, for two weeks. Ophthalmic examination revealed mature cataract OU. Ocular biometry measurements using A-scan ultrasonography for appropriate IOL refractive power calculation was performed. Electroretinography was applied to ensure retinal function is intact. The orangutan underwent phacoemulsification OU and +24 diopter intraocular lens implantation OS to restore vision. IOL implantation was not performed OD because of a posterior capsular tear. Retinoscopy after three weeks postoperatively revealed +2.0 diopters OS. The outcome of the cataract surgery was successful during three years follow-up. The orangutan lived with other orangutans and was alert with normal behavior such as catching food, climbing trees, and swinging hand over hand from one branch to another.
Conclusion: Cataract surgery with phacoemulsification OU and adjusted IOL implantation OD was successful with few complications in this orangutan. The vision was restored with normal behavior, even though an adjusted IOL was inserted in only one eye.Keywords: biometry, cataract, orangutan, phacoemulsification, Pongo pygmaeus.