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Draft:Graham Barrett (ophthalmologist)

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Professor
Graham Barrett
AM, MBBCh, FRACS, SAf, FRACO, FRANZCO
NationalityAustralia
Awards
  • The Binkhorst Medal
  • The Ridley Medal
  • The Susruta Award
  • The Choyce Award
  • The RANZCO Norman Gregg Medal
Academic background
EducationMBBCh SAf
Alma materUniversity of Witwatersrand
InfluencesCharles D. Kelman[1]
Academic work
DisciplineOphthalmology
Sub-disciplineOphthalmic surgery
Main interestsBiometry, cataract surgery, instrumentation, astrophotography

Graham D. Barrett AM, MBBCh, FRACS, SAf, FRACO, FRANZCO is an Australian ophthalmologist, ophthalmic surgeon, inventor,[2] and academic. Barrett is an ophthalmic surgeon at Sir Charles Gairdner Hospital, and a Clinical Professor at the Centre for Ophthalmology and Visual Science, University of Western Australia. He is the inventor of the Barrett Universal II formula for IOL power calculations,[3] and the first Australian ophthalmologist who won the Binkhorst Medal, the Ridley Medal, the Susruta Award, and the Choyce Award in the same year. In 2016, The Ophthalmologist magazine named him in its top 100 global power list and inducted him into its Ophthalmologist Power List in 2022,[4] 2023.[5] Barrett is the co-founder[a] and president of the Australasian Society of Cataract & Refractive Surgeons (AUSCRS).[6][7]

Early life and education

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Barrett completed his medical training (MBBCh) at the University of Witwatersrand in 1977. He then pursued his ophthalmology training, becoming a Fellow of the Royal Australian College of Ophthalmologists in 1984. Barrett also undertook specialty training in Corneal transplantation, External Eye Disease, and Refractive Surgery at the University of Texas Health Science Center at Houston in 1987.[8][9]

Career

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Insertion of the first foldable IOL (1983)

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In in the early eighties (1983[10]-1985),[11] Barrett and Thomas Mazzocco developed and implanted the first foldable intraocular lens (IOL). This allowed the lens to be inserted through a much smaller incision compared to the rigid lenses used previously. The foldable IOL could be compressed and inserted through a small opening, where it would then unfold into place within the eye. This technique significantly reduced surgical trauma, improved recovery times, and decreased the risk of complications such as induced astigmatism, leading to quicker visual rehabilitation and better overall outcomes for patients undergoing cataract surgery.[11]

The Barrett Formula Suite

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The Barrett Formula Suite is a comprehensive set of intraocular lens (IOL) power calculation tools used to enhance the accuracy of cataract surgery outcomes. This suite includes the Barrett Universal II, Barrett True K, and Barrett Toric formulas.[12] These tools account for various ocular measurements and biometric data to improve the prediction of postoperative refractive outcomes, addressing both simple and complex cases, such as eyes with previous refractive surgery or significant astigmatism. The suite has been integrated into devices like the Zeiss IOLMaster 700, further aiding in precise measurements and predictions.[13][14]

The Barrett Universal II Formula

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The Barrett Universal II Formula is a method for calculating intraocular lens (IOL) power based on Gaussian optical principles. It accounts for the shifts in principal planes that occur with different IOL powers, providing more accurate predictions of postoperative refraction. This formula also serves as the basis for the Barrett Toric calculator, which is used for determining the power of toric IOLs to correct astigmatism.[15][12][16][17][18]

A retrospective case series study, by Eppley et al. (2021), compared the Barrett Universal II formula to the Holladay 2, Hoffer Q, and SRK/T formulas for predicting postoperative refraction in pediatric IOL implantation. The Barrett Universal II formula showed the lowest mean prediction error and stable performance across variables. Despite limitations like small sample size and retrospective design, the study supported the Barrett Universal II formula as a viable option for pediatric lens power calculation.[19][20]

The Barrett RX Formula

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The Barrett RX Formula is an advanced tool used by ophthalmologists to manage refractive surprises following cataract surgery with toric intraocular lenses (IOLs). Developed by Barrett, this formula integrates the Barrett Universal II formula and the Barrett Toric Calculator to provide comprehensive solutions for postoperative refractive errors. The tool is particularly valuable for addressing residual astigmatism and optimizing both spherical and toric IOL powers. It allows surgeons to determine the optimal rotation of the IOL or the necessary adjustments in IOL power to achieve the best possible refractive outcome. The Barrett RX Formula can be used to calculate the appropriate strength for a piggyback IOL in cases of significant refractive errors after initial surgery. The formula is accessible through the ASCRS website, which links to the formula application through the website of the Asia-Pacific Association of Cataract and Refractive Surgeons.[21][22][23][24]

On vision, innovation, and RayOne EMV IOL

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Barrett has worked with Rayner to produce the RayOne EMV IOL.[10] In a 2022 interview with Karl Stonecipher, Barrett discussed the development and advantages of the Rayner EMV lens, emphasizing its ability to provide extended depth of focus without compromising the quality of vision, unlike traditional multifocal lenses. He explained the lens's positive spherical aberration, which synergizes with myopia to enhance vision across distances without significant trade-offs. Barrett also touched on his contributions to biometry and the evolution of his formulas, which have significantly improved outcomes in cataract surgery. He highlighted the lens's suitability for a wide range of patients, including those with previous refractive surgeries, underscoring its robustness and tolerance.[25][26]

The toriCAM

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The toriCAM app is a tool designed by Barrett to assist in the precise alignment of IOLs during cataract surgery. The app helps surgeons mark the corneal axis accurately,[b] which is crucial for the effective placement of toric IOLs to correct astigmatism. The accuracy provided by toriCAM reduces the likelihood of alignment errors, which can significantly improve surgical outcomes and patient satisfaction by minimizing postoperative residual astigmatism.[27][28]

Bibliography

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Journal articles

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  • Barrett, Graham D. "An improved universal theoretical formula for intraocular lens power prediction." Journal of Cataract & Refractive Surgery 19, no. 6 (1993): 713-720.
  • Allan, B. D., Perry Short, Geoffrey J. Crawford, G. D. Barrett, and Ian J. Constable. "Pterygium excision with conjunctival autografting: an effective and safe technique." British journal of ophthalmology 77, no. 11 (1993): 698-701.
  • Abulafia, Adi, Graham D. Barrett, Michael Rotenberg, Guy Kleinmann, Adi Levy, Olga Reitblat, Douglas D. Koch, Li Wang, and Ehud I. Assia. "Intraocular lens power calculation for eyes with an axial length greater than 26.0 mm: comparison of formulas and methods." Journal of Cataract & Refractive Surgery 41, no. 3 (2015): 548-556.
  • Abulafia, Adi, Warren E. Hill, Douglas D. Koch, Li Wang, and Graham D. Barrett. "Accuracy of the Barrett True-K formula for intraocular lens power prediction after laser in situ keratomileusis or photorefractive keratectomy for myopia." Journal of Cataract & Refractive Surgery 42, no. 3 (2016): 363-369.

Books

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  • Zhang, Fuxiang, Alan Sugar, and Graham D. Barrett. Pseudophakic monovision: a clinical guide. Georg Thieme Verlag, 2019.

Honors, medals, awards, and fellowships

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Medals

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  • The Binkhorst Medal
  • The Ridley Medal
  • The RANZCO Norman Gregg Medal

Awards

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  • The Susruta Award
  • The Choyce Award
  • The Hawaiian Eye Foundation's International Award for Excellence (2010) [29]

Honors and fellowships

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  • Member of the Order of Australia (AM)
  • Fellow of the Royal Australasian College of Surgeons (FRACS)
  • Fellow of the Royal Australian and New Zealand College of Ophthalmologists (FRANZCO)

Personal life

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Barrett lives and practices in Perth, Western Australia.[14] He is astronomy hobbyist.[4]

References

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  1. ^ "Learn how curiosity propels astigmatism innovations". 10 May 2016.
  2. ^ "Graham D. Barrett Inventions, Patents and Patent Applications - Justia Patents Search". patents.justia.com. Retrieved 2024-07-02.
  3. ^ The European Society of Cataract & Refractive Surgeons (ESCRS) (2019-12-19). EUROTIMES EYE CONTACT: IOL Power Calculations - Graham Barrett – via YouTube.
  4. ^ a b "Graham D. Barrett". The Ophthalmologist. Retrieved 2024-07-02.
  5. ^ Hume, Myles (2023-12-20). "Events that defined the Australian ophthalmic sector in 2023". Insight. Retrieved 2024-07-02.
  6. ^ scottg (2022-08-10). "AUSCRS Conference 2022". Dr Rick Wolfe. Retrieved 2024-07-02.
  7. ^ "Professor Graham Barrett AM, MBBCh, FRANZCO". Lions Eye Institute.
  8. ^ "Graham Barrett". Power List. Retrieved 2024-07-17.
  9. ^ "Prof. Graham Barrett". AUSCRS. Retrieved 2024-07-17.
  10. ^ a b Hume, Myles (2024-04-23). "Prof Graham Barrett on bringing the RayOne EMV IOL to market". Insight.
  11. ^ a b "Volume 6, Chapter 6. Cataract Surgery". www.oculist.net. Retrieved 2024-07-02.
  12. ^ a b Haag-Streit (2019-11-07). ESCRS 2019 Paris - New Technology for Improved Outcomes in Cataract Surgery - Graham Barrett. Retrieved 2024-07-02 – via YouTube.
  13. ^ Pereira, Austin; Popovic, Marko M.; Ahmed, Yusuf; Lloyd, John C.; El-Defrawy, Sherif; Gorfinkel, John; Schlenker, Matthew B. (December 2021). "A comparative analysis of 12 intraocular lens power formulas". International Ophthalmology. 41 (12): 4137–4150. doi:10.1007/s10792-021-01966-z. ISSN 0165-5701. PMID 34318369.
  14. ^ a b Topcon Healthcare Europe (2017-11-30). Graham Barrett – The Barrett Formula Suite – via YouTube.
  15. ^ Subhabrata Bhattacharya (2021-06-25). The concept of Barrett Universal II formulae for IOL power calculation. Retrieved 2024-07-02 – via YouTube.
  16. ^ Kuthirummal, Nikhil; Vanathi, Murugesan; Mukhija, Ritika; Gupta, Noopur; Meel, Rachna; Saxena, Rohit; Tandon, Radhika (January 2020). "Evaluation of Barrett universal II formula for intraocular lens power calculation in Asian Indian population". Indian Journal of Ophthalmology. 68 (1): 59–64. doi:10.4103/ijo.IJO_600_19. ISSN 0301-4738. PMC 6951124. PMID 31856468.
  17. ^ "Barrett Universal II Formula V1.05".
  18. ^ Brennan, Kristine. "Calculating for Success: IOLs in Difficult Eyes". www.reviewofophthalmology.com. Retrieved 2024-07-02.
  19. ^ Eppley, Sarah E.; Arnold, Benjamin F.; Tadros, Dina; Pasricha, Neel; de Alba Campomanes, Alejandra G. (May 2021). "Accuracy of a universal theoretical formula for power calculation in pediatric intraocular lens implantation". Journal of Cataract and Refractive Surgery. 47 (5): 599–605. doi:10.1097/j.jcrs.0000000000000495. ISSN 0886-3350. PMID 33181623.
  20. ^ "Barrett Universal II formula is a viable option for pediatric IOL power calculation". American Academy of Ophthalmology. 2022-01-19. Retrieved 2024-07-02.
  21. ^ "Barrett RX Formula". ascrs.org.
  22. ^ "The Barrett Rx Formula". CRSToday.
  23. ^ "The Barrett Rx Formula". Glaucoma Today.
  24. ^ "Barrett Rx Formula - Outcome Analysis". Ophthalmology 360.
  25. ^ EYE NEWS MEDIA (2022-10-27). Karl Stonecipher, MD talks with Graham Barrett, MD on his journey developing RayOne EMV – via YouTube.
  26. ^ Rayner (2024-02-06). Peer2Peer | Prof Barrett Answers RayOne EMV FAQs. Retrieved 2024-07-03 – via YouTube.
  27. ^ "Innovative Toric IOL Calculators and How to Use Them". CRSTG | Europe Edition. Retrieved 2024-07-02.
  28. ^ Pallas, Andreas; Yeo, Tun Kuan; Trevenen, Michelle; Barrett, Graham (March 2018). "Evaluation of the Accuracy of Two Marking Methods and the Novel toriCAM Application for Toric Intraocular Lens Alignment". Journal of Refractive Surgery. 34 (3): 150–155. doi:10.3928/1081597X-20180115-03. ISSN 1081-597X. PMID 29522223.
  29. ^ Altersitz, K.; Bechtel, B.; Mullin, D. W. (2010-02-25). "Hawaiian eye foundation honors two ophthalmologists for service to the profession". Ocular Surgery News. Vol. 28, no. 4. p. 13. Graham Barrett, FRACO, FRACS, was awarded the Hawaiian Eye Foundation's International Award for Excellence. Dr. Barrett, of Australia, is a noted professor and lecturer throughout Asia, as well as an innovator in small-incision cataract techniques and phacoemulsification.

Footnotes

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  1. ^ With Rick Wolfe in 1995.
  2. ^ The corneal axis refers to the meridian along which the cornea exhibits the greatest or least curvature. In the context of astigmatism, it is critical because astigmatism results from an uneven curvature of the cornea, causing light to refract unevenly and creating blurred vision. The steepest and flattest curvatures of the cornea define these principal meridians.
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