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srk [2026/07/22 15:50] – [Step 7: IOL Emmetropic Power] Scott Larsonsrk [2026/07/28 12:31] (current) – Scott Larson
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 ====== SRK/T (Sanders-Retzlaff-Kraff/Theoretical) Formula ====== ====== SRK/T (Sanders-Retzlaff-Kraff/Theoretical) Formula ======
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 The SRK/T is a third-generation IOL power calculation formula combining theoretical optics with empirical regression optimization, published by Retzlaff, Sanders, and Kraff in 1990. The SRK/T is a third-generation IOL power calculation formula combining theoretical optics with empirical regression optimization, published by Retzlaff, Sanders, and Kraff in 1990.
  
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   * **na** = refractive index of aqueous/vitreous (1.336)   * **na** = refractive index of aqueous/vitreous (1.336)
   * **nc** = corneal refractive index (1.333)   * **nc** = corneal refractive index (1.333)
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 ===== Step 8: Refraction Correction ===== ===== Step 8: Refraction Correction =====
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   * The **T2 modification** (Sheard et al., 2010) later addressed nonphysiologic behavior in the corneal height calculation step   * The **T2 modification** (Sheard et al., 2010) later addressed nonphysiologic behavior in the corneal height calculation step
  
 +=====Reference=====
 +[[https://docs.eyefixer.org/Cataract/IOL%20Calculations/Development%20of%20the%20SRK_T%20intraocular%20lens%20implant%20power%20calculation%20formula.pdf|Development of the SRK/T intraocular lens implant power calculation formula. Retzlaff et al. J Cataract Refract Surg. 1990;16:333-339]]
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 +{{tag>cataract}}