fa بررسی تغییرات کراتومتری و عیوب انکساری در بیماران مبتلا به ناخنک قبل و بعد از تزریق آمپول میتومایسین C General پژوهشي Research Article Pterygium is the development of pinguecula that makes a mass of oval and palmy shape near limbus and its main treatment is surgery but due to some complications and high recurrence after syrgery, subconjunctival injection of mitomycin -C as a safe and effective treatment was detected in many researches so this study determine this purpose and prevelance in Birjand.   Materials and Methods: 30 eyes patients with pterygium referred to Vali- Asr of Birjand Hospital received 0.1 ml of 0.2 mg/ml mitomycin -subconjunectively injected into the body of the pterygium. After injection, patients were followed up at first week 3-5 months after pterygium injection. Patients were examimed at all visits for conjunctiva erythematic, epithehial defects and pterygium size reductive (regression of pterygium ). Data were gathered via 3 questionnaires. Then they were analyzed by SPSS and paired T test.(α=0.05)   Results: The complications after sub. Conjuntive mitomycin- C injection were mild chemosis and lonf discomfort and redness in the site of injection for four days that were seen in six patients (20%). No toxicity of mitomycin- C were found the size of pterygium was reduced in ( mean 0.48 mm ) 83% of cases and in all cases there were not seen progression and the amount of Astigmatism reduced (mean 0.46 diopter) in 70% cases.   Conclusion: Subconjunctival injection of mitomycin- C is an effective treatment and reduces the size of pterygium as well as redness and astigmatism. Pterygium,Mitomycin C,Subconjunctival 44 48 http://mcj.bums.ac.ir/browse.php?a_code=A-10-1-417&slc_lang=fa&sid=1 Mohammad Hasan Davari محمدحسین داوری 10031947532846004627 10031947532846004627 No Assistant Professor, Department of Ophthalmology, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran استادیار گروه آموزشی چشم پزشکی دانشکده پزشکی دانشگاه علوم پزشکی بیرجند Sheida Pejmankhah شیدا پژمان‌خواه 10031947532846004628 10031947532846004628 Yes Instructor, Faculty of Nursing and Midwifery, Birjand University of Medical Sciences, Birjand, Iran. Email:vojodhasti@yahoo.com کارشناس ارشد پرستاری و عضو هیات علمی دانشکده پرستاری و مامایی دانشگاه علوم پزشکی بیرجند. تلفن:4440550-0561 پست الکترونیک: vojodhasti@yahoo.com Nooshin Abdolah Challaki نوشین عبداله چاهکی 10031947532846004629 10031947532846004629 No General Practitioner پزشک عمومی