眼视光学杂志
眼視光學雜誌
안시광학잡지
CHINESE JOURNAL OF OPTOMEY & OPHTHALMOLOGY
2005年
3期
145-151
,共7页
视力%非线性成长率%屈光,眼%眼轴
視力%非線性成長率%屈光,眼%眼軸
시력%비선성성장솔%굴광,안%안축
vision%nonlinear growth rate%refractive,ocular%axia of eye
目的使用非线性成长率理论分析人眼视力发展规律.方法使用高斯光学及成像方程推导出两个参数:屈光状态改变率(M)及眼轴成长率(N),用以预测MOS(初始近视)、年龄(A*)及其后视力的发展情况.结果当有效焦距F=(21-22)、密码M=(2.67-2.9)(D/mm)时,此计算值符合实验平均值(2.7).当年龄A*=(3,6)岁的屈光度变化已知时,我们计算其MOS预测年龄为A*=(7.3,21.8)岁(在不同条件下).此值反比于M值在A=6及A=3的比值或N=N-N*,即非正视态及正视态的眼轴成长率之差.本理论也可用来预测在年龄A=25时的近视度,分别为D=-14及-0.49的上述两例情况,同时也能分析Lam等人的测量值(由出生到青年期的视力发展情况).结论本理论可预测MOS、其后发展情况及其符合实验值(M).使用成长率差值(dN)比使用L/r1比值能更准确地预测MOS.
目的使用非線性成長率理論分析人眼視力髮展規律.方法使用高斯光學及成像方程推導齣兩箇參數:屈光狀態改變率(M)及眼軸成長率(N),用以預測MOS(初始近視)、年齡(A*)及其後視力的髮展情況.結果噹有效焦距F=(21-22)、密碼M=(2.67-2.9)(D/mm)時,此計算值符閤實驗平均值(2.7).噹年齡A*=(3,6)歲的屈光度變化已知時,我們計算其MOS預測年齡為A*=(7.3,21.8)歲(在不同條件下).此值反比于M值在A=6及A=3的比值或N=N-N*,即非正視態及正視態的眼軸成長率之差.本理論也可用來預測在年齡A=25時的近視度,分彆為D=-14及-0.49的上述兩例情況,同時也能分析Lam等人的測量值(由齣生到青年期的視力髮展情況).結論本理論可預測MOS、其後髮展情況及其符閤實驗值(M).使用成長率差值(dN)比使用L/r1比值能更準確地預測MOS.
목적사용비선성성장솔이론분석인안시력발전규률.방법사용고사광학급성상방정추도출량개삼수:굴광상태개변솔(M)급안축성장솔(N),용이예측MOS(초시근시)、년령(A*)급기후시력적발전정황.결과당유효초거F=(21-22)、밀마M=(2.67-2.9)(D/mm)시,차계산치부합실험평균치(2.7).당년령A*=(3,6)세적굴광도변화이지시,아문계산기MOS예측년령위A*=(7.3,21.8)세(재불동조건하).차치반비우M치재A=6급A=3적비치혹N=N-N*,즉비정시태급정시태적안축성장솔지차.본이론야가용래예측재년령A=25시적근시도,분별위D=-14급-0.49적상술량례정황,동시야능분석Lam등인적측량치(유출생도청년기적시력발전정황).결론본이론가예측MOS、기후발전정황급기부합실험치(M).사용성장솔차치(dN)비사용L/r1비치능경준학지예측MOS.
Objective A nonlinear growth rate theory for the analysis of vision development in human eye. Methods Using gaussian optics and image equation, we derive for mulas for refractive error change rate (M = dD/dL) and axial growth rate (N = dL/dA ), where dL and dA are the axial and age change.These two rates may be used to predict the myopia onset (MOS) age (A * ) and D at a predicted period under a linear approximation. Resnlts For effective focal length F = (21-22) mm, we calculated D values and ratesN at age A = (3,6), wepredict A* = (7.3, 21.8) years forD = (+3.5, +1.0) andD =( + 2.5, 2.0 ), respectively. The A* is shown to be inverse proportionally to the ratio of the M value at age 6 and 3, or dN= N - N *, the difference of the axial growth rate of the ametropic and emmetropic state. We also predict the repiatction error at age 25 to be about ( - 14, -0.4) diopter for above example. Our calculated data may be used to analyze the measured refraction data of Lam et al for infant to youth. Concluslon It is possible to predict MOS and vision development using a growth rate theory under certain assumptions. Our calculated value of M is consistent with measured data. A better predictor for MOS shall be based on dN = N- N* rather than the ratio of L/r1, or N alone.
