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;
FLcO=RALM+ 0U.200L; AR
R = 337.5/K;
SF = 0.5663 * A - 65.60 ;
Rag = R;
if(R>=7.0)
7.0
Байду номын сангаас
if(R<7.0)
AGx = 12.5/23.45 * AL ; if (AGx > 13.5) AGx = 13.5;
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
IOL =
(1336 * (S3 – 0.001*Refr * S4))
(S1*(S2-0.001 * Refr * S5))
Dem = 1000 * S3 / (S1*S2) ;
Dam = (1336 * (S3 – 0.001*Dr * S4)) (S1*(S2-0.001 * Dr * S5))
IOL 人工晶体计算公式
天津迈达医学科技有限公司 MEDA CO., LTD
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
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 ;
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 );
= 1.00 (if Dem <= 14)
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;

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
人工晶体计算公式（IOL FORMULAR）
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;
1. SRK-II 2. SRK-T 3. BINKHORST II 4. HOLLADAY 5. HOFFER-Q 6. HAIGIS
SRK-II FORMULAR
Dem = A – 2.5 * AL – 0.9 * K + C C （Correction）

= 3 （if AL < 20 mm） = 2 (if 20 <= AL < 21 mm) = 1 (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）
S2 = 1.336 * K – 0.3333 * ACDe;
S3 = 1.336 * K – 0.3333 * L0;
S4 = 12 * S3 + L0 * K;
S5 = 12 * S2 + ACDe * K;
Refr = (1336 * S3 – IOL * S1 * S2) (1.336*S4 – 0.001 * IOL * S1 * S5)
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
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 ;