PMID- 30527793
OWN - NLM
STAT- In-Data-Review
LR  - 20190310
IS  - 1873-4502 (Electronic)
IS  - 0886-3350 (Linking)
VI  - 45
IP  - 3
DP  - 2019 Mar
TI  - Improving toric intraocular lens calculations using total surgically induced
      astigmatism for a 2.5 mm temporal incision.
PG  - 272-283
LID - S0886-3350(18)30889-7 [pii]
LID - 10.1016/j.jcrs.2018.09.028 [doi]
AB  - PURPOSE: To determine in cataract surgery the total surgically induced
      astigmatism (SIA) that accounts for all factors that contribute to the difference
      between preoperative keratometric and postoperative refractive astigmatism other 
      than any toricity of an intraocular lens (IOL). SETTING: Twenty surgical sites in
      the United States. DESIGN: Retrospective case series. METHODS: An analysis was
      performed of 4 clinical trials involving toric IOLs and nontoric IOLs in standard
      cataract surgery. Data included preoperative keratometry and manifest refraction 
      measurements at multiple postoperative visits. For each eye with a nontoric IOL, 
      the total SIA vector was calculated as the vector difference between
      postoperative refractive and preoperative keratometric astigmatism. The
      relationship between the total SIA vector and meridian of preoperative
      keratometric astigmatism was determined and used to develop a new calculation
      algorithm for toric IOL implantation. The algorithm was tested retrospectively to
      identify optimum candidate eyes for various cylinder power toric IOLs as well as 
      to compare results with the Barrett toric calculator. RESULTS: The total SIA
      vector was a significant contributor to surgically associated astigmatic changes 
      in eyes receiving nontoric IOLs. The total SIA vector was dependent on the
      preoperative steep meridian in a consistent fashion, allowing development of a
      new calculation algorithm for toric IOL correction. Retrospectively applying this
      algorithm to toric IOL cases led to significantly improved differences between
      toric and nontoric control populations. CONCLUSIONS: Total SIA analysis is a new 
      approach for toric IOL surgery. Because it considers all factors that may
      influence outcomes, the total SIA is a useful inclusion in toric IOL surgical
      planning.
CI  - Copyright (c) 2018 ASCRS and ESCRS. Published by Elsevier Inc. All rights
      reserved.
FAU - Holladay, Jack T
AU  - Holladay JT
AD  - Department of Ophthalmology, Baylor College of Medicine, Houston, USA. Electronic
      address: holladay@docholladay.com.
FAU - Pettit, George
AU  - Pettit G
AD  - Alcon Research Laboratories, Dallas, Texas, USA.
LA  - eng
PT  - Journal Article
DEP - 20181207
PL  - United States
TA  - J Cataract Refract Surg
JT  - Journal of cataract and refractive surgery
JID - 8604171
EDAT- 2018/12/12 06:00
MHDA- 2018/12/12 06:00
CRDT- 2018/12/12 06:00
PHST- 2018/05/14 00:00 [received]
PHST- 2018/08/27 00:00 [revised]
PHST- 2018/09/27 00:00 [accepted]
PHST- 2018/12/12 06:00 [pubmed]
PHST- 2018/12/12 06:00 [medline]
PHST- 2018/12/12 06:00 [entrez]
AID - S0886-3350(18)30889-7 [pii]
AID - 10.1016/j.jcrs.2018.09.028 [doi]
PST - ppublish
SO  - J Cataract Refract Surg. 2019 Mar;45(3):272-283. doi: 10.1016/j.jcrs.2018.09.028.
      Epub 2018 Dec 7.