IOL 人工晶体计算公式.

Binkhorst-II Formular
Lb = AL + 0.1984 ACDb = ACD * (AL/23.45) ; (if Lb<26) 1.1087 * ACD ; (if Lb>=26) ACDx = ACD (Anterior Chamber IOLs); ACDb(Posterior Chamble IOLs); R = 337.5/K ;
IOL 人工晶体计算公式
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一 参数变量（Variables）
AL -- 眼轴长度 （Axial Length）(15mm<= AL <= 40mm) K -- 平均的角膜曲率 = (K1+K2)/2 Average dioptric power of cornea R -- 曲率半径（mm) Cornea curvature in mm ACD – (术后)前方深度 ，常数 (0.5mm < ACD < 10mm) PostOperate Anterior Chamber Depth A -- 人工晶体常数 (100 <= A <= 130) DR -- 术后希望预留的屈光度数 PostOperate Desired Refraction Dem – 正视眼度数 （Emmetropic power） Dam –在术后希望预留的屈光度数时，需植入人工晶体的度数 Refr – 目标屈光度数 （Target Refraction） IOL – 需植入的人工晶体度数
SRK-T Formular
Lc = AL; (AL <= 24.2) -3.446 + (1.716 * AL) –(0.0237*AL*AL); (AL>24.2) Rmm = 337.5/K; C1 = -5.40948 + 0.58412*Lc + 0.098*K; Rc = [Rmm*Rmm-C1*C1/4]; If Rc<0 then Rc = 0; C2 = Rmm –SQRT[Rc]; ACD = 0.62467 * A – 68.74709; ACDe = C2 +ACD-3.3357; L0 = 0.97971 * AL + 0.65696 ; S1 = L0 – ACDe; S2 = 1.336 * K – 0.3333 * ACDe; S3 = 1.336 * K – 0.3333 * L0; S4 = 12 * S3 + L0 * K; S5 = 12 * S2 + ACDe * K;
人工晶体计算公式（IOL Formular）
1. 2. 3. 4. 5. 6.
SRK-II SRK-T BINKHORST II HOLLADAY HOFFER-Q HAIGIS
SRK-II Formular
Dem = A – 2.5 * AL – 0.9 * K + C C （Correction）
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Refr =
(1336 * S3 – IOL * S1 * S2)
(1.336*S4 – 0.001 * IOL * S1 * S5)
IOL =
(1336 * (S3 – 0.001*Refr * S4)) (S1*(S2-0.001 * Refr * S5))
Dem =
1000 * S3 / (S1*S2) ;
IOL = Get_IOL_T( ACDx, Lc, R , Refr ); Dem = Get_IOL_T( ACDx, Lc, R , 0 ); Dam = Get_IOL_T( ACDx, Lc, R , Dr ); Refr = Get_Refr_t( ACDx, Lc, R, IOL );
Lc R SF Rag = AL + 0.200; = 337.5/K; = 0.5663 * A - 65.60 ; = R; if(R>=7.0) 7.0 if(R<7.0) AGx = 12.5/23.45 * AL ; if (AGx > 13.5) AGx = 13.5; ACDh = 0.56 + Rag - sqrt(Rag*Rag - AGx*AGx/4); ACDx = ACDh + SF;
IOL = Get_IOL_T( ACDx, Lb, R , Refr ); Dem = Get_IOL_T( ACDx, Lb, R , 0 ); Dam = Get_IOL_T( ACDx, Lb, R , Dr ); Refr =Get_Refr_t( ACDx, Lb, R, IOL );
Holladay Formular
Dam = (1336 * (S3 – 0.001*Dr * S4)) (S1*(S2-0.001 * Dr * S5))
SRK-T Formular(2)
Lc = 0.97971 *AL + 0.65696 ; R = 337.5/K; Lcor = AL; if (My_AL <= 24.2) -3.446 + 1.716 * AL - 0.0237 * AL * AL ; if (My_AL > 24.2) Crwdest = -5.40984 + 0.58412*Lcor + 0.098 *K; ACDt = 0.62467 * A - 68.74709 ; x = R*R - Crwdest*Crwdest/4 ; if(x<0) x = 0; Hest = R - sqrt(x) ; ACDx = Hest + ACDt - 3.3357 ;
= 3 （if AL < 20 mm）
=2 =1 (if 20 <= AL < 21 mm) (if 21 <= AL < 22 mm)
=0
(if 22<=AL <24.5 mm)
= -0.5 (if AL >= 24.5) ------------------------------------------------------------------------------------IOL = Dem – (Refr * Rf); Dam = Dem – (Dr * Rf); Refr = (Dem-IOL)/Rf; 其中 Rf = 1.25 （if Dem > 14） = 1.00 (if Dem <= 14)