The role of preoperative biometry in selecting initial contact lens power in the Infant Aphakia Treatment Study
Rupal H Trivedi, Scott R Lambert, Michael J Lynn, M Edward Wilson, Infant Aphakia Treatment Study Group, Scott R Lambert, Lindreth DuBois, Michael Lynn, Betsy Bridgman, Marianne Celano, Julia Cleveland, George Cotsonis, Carey Drews-Botsch, Nana Freret, Lu Lu, Azhar Nizam, Seegar Swanson, Thandeka Tutu-Gxashe, E Eugenie Hartmann, Clara Edwards, Claudio Busettini, Samuel Hayley, Anna Carrigan, Scott R Lambert, Edward G Buckley, David A Plager, M Edward Wilson, Michael Lynn, Lindreth DuBois, Carolyn Drews-Botsch, E Eugenie Hartmann, Donald F Everett, Buddy Russell, Michael Ward, M Edward Wilson, Margaret Bozic, Carol Bradham, Deborah K VanderVeen, Theresa A Mansfield, Kathryn Bisceglia Miller, Stephen P Christiansen, Erick D Bothun, Ann Holleschau, Jason Jedlicka, Patricia Winters, Elias I Traboulsi, Susan Crowe, Heather Hasley Cimino, Kimberly G Yen, Maria Castanes, Alma Sanchez, Shirley York, Margaret Olfson, Stacy Malone, David T Wheeler, Ann U Stout, Paula Rauch, Kimberly Beaudet, Pam Berg, Scott R Lambert, Amy K Hutchinson, Lindreth DuBois, Rachel Robb, Marla J Shainberg, Edward G Buckley, Sharon F Freedman, Lois Duncan, B W Phillips, John T Petrowski, David Morrison, Sandy Owings, Ron Biernacki, Christine Franklin, David A Plager, Daniel E Neely, Michele Whitaker, Donna Bates, Dana Donaldson, Stacey Kruger, Charlotte Tibi, Susan Vega, David R Weakley, David R Stager Jr, Joost Felius, Clare Dias, Debra L Sager, Todd Brantley, Robert Hardy, Eileen Birch, Ken Cheng, Richard Hertle, Craig Kollman, Marshalyn Yeargin-Allsopp, Cindy Bachman, Donald F Everett, Allen Beck, Rupal H Trivedi, Scott R Lambert, Michael J Lynn, M Edward Wilson, Infant Aphakia Treatment Study Group, Scott R Lambert, Lindreth DuBois, Michael Lynn, Betsy Bridgman, Marianne Celano, Julia Cleveland, George Cotsonis, Carey Drews-Botsch, Nana Freret, Lu Lu, Azhar Nizam, Seegar Swanson, Thandeka Tutu-Gxashe, E Eugenie Hartmann, Clara Edwards, Claudio Busettini, Samuel Hayley, Anna Carrigan, Scott R Lambert, Edward G Buckley, David A Plager, M Edward Wilson, Michael Lynn, Lindreth DuBois, Carolyn Drews-Botsch, E Eugenie Hartmann, Donald F Everett, Buddy Russell, Michael Ward, M Edward Wilson, Margaret Bozic, Carol Bradham, Deborah K VanderVeen, Theresa A Mansfield, Kathryn Bisceglia Miller, Stephen P Christiansen, Erick D Bothun, Ann Holleschau, Jason Jedlicka, Patricia Winters, Elias I Traboulsi, Susan Crowe, Heather Hasley Cimino, Kimberly G Yen, Maria Castanes, Alma Sanchez, Shirley York, Margaret Olfson, Stacy Malone, David T Wheeler, Ann U Stout, Paula Rauch, Kimberly Beaudet, Pam Berg, Scott R Lambert, Amy K Hutchinson, Lindreth DuBois, Rachel Robb, Marla J Shainberg, Edward G Buckley, Sharon F Freedman, Lois Duncan, B W Phillips, John T Petrowski, David Morrison, Sandy Owings, Ron Biernacki, Christine Franklin, David A Plager, Daniel E Neely, Michele Whitaker, Donna Bates, Dana Donaldson, Stacey Kruger, Charlotte Tibi, Susan Vega, David R Weakley, David R Stager Jr, Joost Felius, Clare Dias, Debra L Sager, Todd Brantley, Robert Hardy, Eileen Birch, Ken Cheng, Richard Hertle, Craig Kollman, Marshalyn Yeargin-Allsopp, Cindy Bachman, Donald F Everett, Allen Beck
Abstract
Purpose: To investigate the role of preoperative biometry for selecting initial contact lens power.
Methods: Patients randomized to receive contact lenses in the Infant Aphakia Treatment Study (IATS) were retrospectively analyzed. Inclusion criteria were availability of both a preoperative immersion axial length measurement and a 1-month postoperative refractive value. The target contact lens power for distance was determined using 1-month postoperative spherical equivalent refraction (after adjusting for a vertex distance) over the known contact lens power. We compared targeted contact lens power for distance with three other treatment techniques: (1) 30 D contact lens (32 D minus 2 D overcorrection for near vision based on IATS protocol); (2) regression-estimated contact lens power of 84.4 - 3.2 × axial length; and (3) IOL power calculated using the Sanders-Retzlaff-Kraff (SRK/T) regression formula with a modified A-constant (112.176). Prediction error (targeted minus estimated contact lens power) and its absolute values were calculated.
Results: A total of 34 eyes of 34 patients met inclusion criteria. Age at the time of cataract surgery was 2.4 ± 1.7 months. Follow-up refraction was performed at 31 ± 3 days after surgery. Target contact lens power for distance was 26.0 ± 4.5 D for the IATS cohort (which excluded infants with corneal diameter <9 mm). The mean prediction error was -4.0, -1.0, and -2.0 D and mean absolute prediction error was 4.4, 2.2, and 2.9 D, respectively, for 30 D contact lens, regression, and SRK/T-estimated power.
Conclusions: Preoperative biometry can be used to estimate contact lens power for distance if an accurate refraction cannot be obtained initially.
Copyright © 2014 American Association for Pediatric Ophthalmology and Strabismus. Published by Mosby, Inc. All rights reserved.
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Source: PubMed