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Effect of Visual acuity for Change of Astigmatism axis in Myopic astigmatism

근시성 난시안에서 난시축 변화가 시력에 미치는 영향

  • Received : 2015.10.25
  • Accepted : 2015.12.20
  • Published : 2015.12.28

Abstract

The purpose of this study is to compare the status of eyesight according to the change of astigmatism axis in myopic astigmatism and to minimize errors in making astigmatic glasses based on accurate optometry and prescription. The subjects were 93 males and females(186 eyes) who have myopic astigmatism without any ocular disease or systemic disease. We performed comparative analysis on the status of visual acuity according to the change of astigmatism axis to 5, 10 and 15 degree in corrected eyesight 1.0. The direct astigmatism was the most common astigmatism type among the 186 eyes. After all subjects were perfectly corrected into 1.0, the change of astigmatism axis affected eyesight; The results suggested that the more change was made in astigmatism axis, the worse their eyesight would become. The main astigmatism type was changed from direct astigmatism to inverse astigmatism as age increased. The change of the astigmatism axis resulted in failing of corrected eyesight. Therefore, the convergence of examination and correction for astigmatism strength and axis is necessary when conducting refraction inspection for astigmatism.

본 연구는 근시성 난시안에서 난시축의 변화에 따른 시력상태를 비교분석하고, 정확한 시력검사와 처방서에 따른 난시 교정용 안경의 조제 가공 오차를 최소화 하고자 한다. 안질환 및 전신질환이 없는 근시성 난시를 가지고 있는 남 녀 93명(186안)을 대상자로 선정하였다. 완전교정상태에서 난시축의 $5^{\circ}$, $10^{\circ}$, $15^{\circ}$ 변화하였을 때의 시력을 비교하였다. 난시의 종류는 186안 중에서 중에서 직난시의 비율이 가장 높았다. 1.0으로 완전교정시 난시축의 변화에 따른 시력의 변화는 난시축 변화가 크면 클수록 시력이 감소하는 것으로 나타났다. 난시의 형태는 연령의 증가와 함께 직난시에서 도난시로 바뀌는 것을 알 수 있었으며, 난시의 교정축 변화가 클수록 교정시력은 떨어지는 것으로 나타났다. 난시의 굴절검사를 실시할 때는 난시도수와 난시축을 정확히 검사하고 교정하는 것이 융합되어야 할 것이다.

Keywords

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