<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0864-2176</journal-id>
<journal-title><![CDATA[Revista Cubana de Oftalmología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Oftalmol]]></abbrev-journal-title>
<issn>0864-2176</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-21762021000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fórmula Barrett True K en pacientes con catarata operados de cirugía refractiva corneal]]></article-title>
<article-title xml:lang="en"><![CDATA[The Barrett True-K formula in cataract patients undergoing corneal refractive surgery]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Candelaria]]></surname>
<given-names><![CDATA[Eneida de la C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cangrejo Forero]]></surname>
<given-names><![CDATA[Edgar Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Veitía Rovirosa]]></surname>
<given-names><![CDATA[Zucell Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez Pérez]]></surname>
<given-names><![CDATA[Melany]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas Díaz]]></surname>
<given-names><![CDATA[Taimi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Cubano de Oftalmología &#8220;Ramón Pando Ferrer&#8221;  ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-21762021000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-21762021000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-21762021000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo: Determinar los resultados refractivos en pacientes operados de catarata con cirugía refractiva corneal, según el cálculo del poder dióptrico de la lente intraocular con la fórmula Barrett True K.  Métodos:  Se realizó un estudio pre-experimental, del tipo antes y después, en el cual fueron incluidos 18 pacientes (31 ojos). En ellos se analizaron variables demográficas y clínicas. La principal variable de salida fue la predictibilidad del componente esférico ± 0,50 D, ± 1,0 D según la longitud axial.  Resultados: Fueron estudiados pacientes con un promedio de edad de 59,4 años, predominantemente del sexo femenino (66,7 %). El 77,4 % fue operado con queratotomía radial. Con la cirugía de catarata se produjo una mejora ostensible de la agudeza visual no corregida (mediana preoperatoria: 0,12 y mediana posoperatoria: 0,60). Solo el 9,7 % de los ojos analizados presentó una agudeza visual sin corregir de 20/20 y el 90,3 % de 20/40 o más. La cantidad de ojos con un equivalente esférico de ± 0,50 disminuyó en la medida en que aumentó la longitud axial (corta: 100 %; normal: 57,1 %; larga: 22,7 %), no así la predictibilidad del componente esférico de ± 0,50, que aumentó (corta: 50,0 %; normal: 57,1 %; larga: 63,6 %).  Conclusiones:  La fórmula Barrett True K resulta útil para el cálculo de la lente intraocular en pacientes operados de catarata y cirugía refractiva corneal previa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective: Determine refractive outcomes in patients undergoing cataract corneal refractive surgery based on intraocular lens dioptric power calculation with the Barrett True-K formula.  Methods:  A pre-experimental before/after study was conducted of 18 patients (31 eyes). Demographic and clinical variables were analyzed. The main output variable was spherical component predictability ± 0.50 D, ± 1.0 D according to axial length.  Results: Mean age was 59.4 years; female sex prevailed (66.7%). Of the patients studied, 77.4% underwent radial keratotomy. Cataract surgery led to notable uncorrected visual acuity improvement (preoperative mean: 0.12; postoperative mean: 0.60). Only 9.7% of the eyes examined had an uncorrected visual acuity of 20/20, whereas 90.3% had 20/40 or more. The number of eyes with a spherical equivalent of ± 0.50 fell as axial length rose (near: 100%; normal: 57.1%; far: 22.7%), unlike ± 0.50 spherical component predictability, which rose from near: 50.0%; normal: 57.1%; far: 63.6%.  Conclusions:  The Barrett True-K formula is useful for intraocular lens calculation in patients undergoing previous cataract and corneal refractive surgery.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Barrett True K]]></kwd>
<kwd lng="es"><![CDATA[cirugía refractiva corneal]]></kwd>
<kwd lng="es"><![CDATA[cálculo de lente intraocular]]></kwd>
<kwd lng="en"><![CDATA[Barrett True-K]]></kwd>
<kwd lng="en"><![CDATA[corneal refractive surgery]]></kwd>
<kwd lng="en"><![CDATA[intraocular lens calculation]]></kwd>
</kwd-group>
</article-meta>
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