Clinical analysis of outpatients with ametropia in Hebeisheng Eye Hospital

Abstract

AIM: To perform a clinical analysis of 1 500 cases of outpatients with ametropia in Hebeisheng Eye Hospital, to provide a theoretical basis for diagnosis, treatment, and prevention of patients with ametropia.METHODS: Totally 1 500 cases(2 840 eyes)of outpatient with ametropia were chosen as the research objects in Hebeisheng Eye Hospital from June 2013 to July 2014. All cases were treated with TOPCON RM-8800 computer optometry instrument for objective optometry, and used TOPCON phoropter for subjective optometry. The combination of the two instruments was taken to determine the diopter later. Diopter and axial distribution of the myopic astigmatism and hyperopic astigmatism were observed, age of astigmatic patient, distribution of astigmatism axis were observed as well. Meanwhile, a total of 150 cases were chosen randomly to measure their corneal curvature, anterior chamber depth, axial length and other static refractive index. All indexes were compared with those of the normal people subsequently, such as amplitude of accommodation, negative relative accommodation, positive relative accommodation, sensitivity of accommodation and other dynamic refractive index. RESULTS: Ametropia types of all patients were mainly simple myopia, simple myopia astigmatism, compound myopic astigmatism, simple hypermetropia, simple hyperopia astigmatism, compound hyperopic astigmatism and mixed astigmatism, the proportion were 38.99%, 3.27%, 23.94%, 4.68%, 1.34%, 13.52%, 15.25% respectively. There were 773 eyes with myopia astigmatism. The proportion of people with a myopia astigmatism diopter of above -0.25 to -0.50, -0.75 to -1.00, -1.25 to -1.50, above -1.75 were 31.05%, 38.55%, 16.56%, 13.84%. There were 421 eyes with hyperopia astigmatism, the proportion of people with hyperopia astigmatism diopter of 0.25-0.50, 0.75-1.00, 1.25- 1.50, >1.75 were 26.60%, 24.94%, 16.63%, 31.83%. Static refractive index of 150 patients(300 eyes)showed that corneal curvature was(41.23±2.43)φ/D, anterior chamber depth was 3.71±0.43mm, axial length 23.45±1.43mm. Dynamic refractive index showed that the amplitude of accommodation 10.56±2.32D, negative relative accommodation 2.31±0.47D, positive relative accommodation -1.82±0.67D, sensitivity of accommodation 11.34±2.21D. All kinds of static and dynamic refractive indexes, the length of ocular axis were statistically different from those of the normal population(PCONCLUSION: The 1 500 cases of patients with ametropia(2 840 eyes)contains mainly simple myopia and compound myopic astigmatism, diopter range in myopia astigmatism were chiefly -0.25 to -0.50, -0.75 to -1.00, hyperopia diopter range consists of >1.75 mostly, among the patients with astigmatism, the older the age, the bigger the number of people with irregular astigmatism, static and dynamic refractive index of patients with ametropic eye shows apparent difference with that of the normal population.

Keywords

• ametropia
• clinical analysis
• myopia
• hyperopia
• astigmatism
• astigmatism