The role of preoperative biometry in selecting initial contact lens power in the Infant Aphakia Treatment Study

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• 作者：Rupal H. Trivedi ; MD ; MSCR^a ; ^{trivedi@musc.edu" class="auth_mail} ; Scott R. Lambert ; MD^b ; Michael J. Lynn ; MS^c ; M. Edward Wilson ; MD^a ; for the Infant Aphakia Treatment Study Group &lowast
• 刊名：Journal of American Association for Pediatric Ophthalmology and Strabismus
• 出版年：June 2014
• 年：2014
• 卷：18
• 期：3
• 页码：251-254
• 全文大小：209 K

文摘

To investigate the role of preoperative biometry for selecting initial contact lens power.

id="absSec_2">Methods

id="abspara0015">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.

id="absSec_3">Results

id="abspara0020">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 &minus;4.0, &minus;1.0, and &minus;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.

id="absSec_4">Conclusions

id="abspara0025">Preoperative biometry can be used to estimate contact lens power for distance if an accurate refraction cannot be obtained initially.id=""><img class="imgLazyJSB inlineImage" height="34" width="36" alt="" title="" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S1091853114001517-fx1.jpg">ipt><img height="34" border="0" style="vertical-align:bottom" width="36" alt="" title="" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S1091853114001517-fx1.jpg">ipt>