We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Comment & Response |

Origin of Multiple Formula Use to Calculate Intraocular Lens Power

Kenneth J. Hoffer, MD1,2
[+] Author Affiliations
1Stein Eye Institute, University of California, Los Angeles
2St Mary’s Eye Center, Santa Monica, California
JAMA Ophthalmol. 2016;134(7):847-848. doi:10.1001/jamaophthalmol.2016.1043.
Text Size: A A A
Published online


To the Editor I read with great interest the recent article by Ladas et al1 and the accompanying Invited Commentary by Hee.2 Hee states, “Despite these technological advances, the preoperative calculation of optimal postoperative IOL [intraocular lens] power has remained essentially unchanged during the past 20 years.”2 This might mean little has happened in IOL power formula development since 1995. This statement does not seem to consider the work done by Thomas Olsen, MD, PhD, Graham D. Barrett, FRACO, FRACS, Wolfgang Haigis, PhD, and many others. In referencing the article on the Hoffer Q formula, the crucial errata are missing.3 Hee also states, “The Haigis formula adds a third variable—preoperative anterior chamber depth.”2 It does not add a third variable; it replaces the corneal power (K) with the preoperative anterior chamber depth and thus uses only 2 variables, not 3.


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

First Page Preview

View Large
First page PDF preview





July 1, 2016
Michael R. Hee, MD, PhD
1Pacific Eye Specialists, Daly City, California
JAMA Ophthalmol. 2016;134(7):848. doi:10.1001/jamaophthalmol.2016.1046.
July 1, 2016
John G. Ladas, MD, PhD; Albert S. Jun, MD, PhD; Uday Devgan, MD
1Wilmer Eye Institute, Baltimore, Maryland
2Jules Stein Eye Institute, University of California, Los Angeles
JAMA Ophthalmol. 2016;134(7):848-849. doi:10.1001/jamaophthalmol.2016.1049.
Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.

See Also...