TY - GEN
T1 - Intraocular lens power estimation by accurate ray tracing for eyes underwent previous refractive surgeries
AU - Yang, Que
AU - Wang, Shanshan
AU - Wang, Kai
AU - Zhang, Chunyu
AU - Zhang, Lu
AU - Meng, Qingyu
AU - Zhu, Qiudong
N1 - Publisher Copyright:
© 2015 SPIE.
PY - 2015
Y1 - 2015
N2 - For normal eyes without history of any ocular surgery, traditional equations for calculating intraocular lens (IOL) power, such as SRK-T, Holladay, Higis, SRK-II, et al., all were relativley accurate. However, for eyes underwent refractive surgeries, such as LASIK, or eyes diagnosed as keratoconus, these equations may cause significant postoperative refractive error, which may cause poor satisfaction after cataract surgery. Although some methods have been carried out to solve this problem, such as Hagis-L equation[1], or using preoperative data (data before LASIK) to estimate K value[2], no precise equations were available for these eyes. Here, we introduced a novel intraocular lens power estimation method by accurate ray tracing with optical design software ZEMAX. Instead of using traditional regression formula, we adopted the exact measured corneal elevation distribution, central corneal thickness, anterior chamber depth, axial length, and estimated effective lens plane as the input parameters. The calculation of intraocular lens power for a patient with keratoconus and another LASIK postoperative patient met very well with their visual capacity after cataract surgery.
AB - For normal eyes without history of any ocular surgery, traditional equations for calculating intraocular lens (IOL) power, such as SRK-T, Holladay, Higis, SRK-II, et al., all were relativley accurate. However, for eyes underwent refractive surgeries, such as LASIK, or eyes diagnosed as keratoconus, these equations may cause significant postoperative refractive error, which may cause poor satisfaction after cataract surgery. Although some methods have been carried out to solve this problem, such as Hagis-L equation[1], or using preoperative data (data before LASIK) to estimate K value[2], no precise equations were available for these eyes. Here, we introduced a novel intraocular lens power estimation method by accurate ray tracing with optical design software ZEMAX. Instead of using traditional regression formula, we adopted the exact measured corneal elevation distribution, central corneal thickness, anterior chamber depth, axial length, and estimated effective lens plane as the input parameters. The calculation of intraocular lens power for a patient with keratoconus and another LASIK postoperative patient met very well with their visual capacity after cataract surgery.
KW - Dynamic Data Exchange
KW - Intraocular Lens Power Estimation
KW - Ray Tracing
KW - Refractive Surgeries
UR - http://www.scopus.com/inward/record.url?scp=84940055231&partnerID=8YFLogxK
U2 - 10.1117/12.2193057
DO - 10.1117/12.2193057
M3 - Conference contribution
AN - SCOPUS:84940055231
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - 2015 International Conference on Optical Instruments and Technology
A2 - Xu, Kexin
A2 - Xiao, Hai
A2 - Zhu, Jigui
A2 - Tam, Hwa-Yaw
A2 - Han, Sen
PB - SPIE
T2 - 2015 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, OIT 2015
Y2 - 17 May 2015 through 19 May 2015
ER -