Person:
Estrella Lumeras, Miguel Ángel

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First Name
Miguel Ángel
Last Name
Estrella Lumeras
URI
https://hdl.handle.net/20.500.14352/79967
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Optometría y Visión
Area
Optica
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    Base Curve Influence on the Fitting and Comfort of the Senofilcon A Contact Lens
    (Journal of Optometry, 2009) González-Cavada Benavides, Javier; Corral Pazos de Provens, Octavio; Niño Rueda, Aranzazu; Estrella Lumeras, Miguel Ángel; Fuentes, José A.; Madrid Costa, David
    PURPOSE: To determine the influence of the base curve on the movement, on the corneal surface mechanical alterations and on the subjective comfort of Senofilcon A contact lens for corneas having central curve radius flatter than 7.80 mm. METHODS: In this prospective, double-masked, contralateral, randomized study, 40 eyes of 20 participants, with keratometric readings above 7.80 mm, were randomly fitted with Senofilcon A contact lenses: one having an 8.80 mm base curve in one eye and another one having 8.40 mm base curve in the other eye. Lens movement, corneal surface mechanical alterations and comfort were assessed in both eyes 15 days after contact lens fitting. RESULTS: At 15 days of contact lens fitting, no statistically significant differences were found regarding lens movement between the lens with the 8.40 mm base curve and the lens with the 8.80 mm base curve. There were not statistically significant differences between groups neither in peripheral nor in central staining, and absence of clinical significance was found. There was a statistically significant difference on comfort rate between the lenses. The mean comfort score for the 8.80 mm base curve was 3.5±0.92, whereas for the 8.40 mm base curve it was 4.39±0.5 (P<0.001). CONCLUSIONS: In corneas with keratometry flatter than, 7.80 mm, 8.80 and 8.40 mm base curves, show acceptable fitting characteristics. Nevertheless, 8.40 mm base curve is more comfortable than 8.80 mm base curve. These results suggest that silicone hydrogel soft contact lenses may require steeper base curve selection criteria than the conventional hydrogel soft lenses in order to improve the comfort.
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    Project number: 322
    Aprendizaje de procedimientos clínicos optométricos mediante vídeos demostrativos
    (2021) Piedrahita Alonso, María Elena; Martín García, Beatriz; Palomo Álvarez, Catalina; Nieto Bona, Amelia; Estrella Lumeras, Miguel Ángel; Barrio De Santos, Ana Rosa; Valcayo Peñalva, Isabel; Baños Morales, Carmelo
    El objetivo principal del proyecto ha sido crear en el campus virtual de la asignatura Optometría IV del Grado de Óptica y Optometría una plataforma de material docente virtual basado en presentaciones, vídeos de exploración y cuestionarios autoevaluativos. En ellos el alumno ha podido visualizar la ejecución por parte del profesor de los procedimientos que se estudian en la asignatura en pacientes pediátricos o con alteraciones de la visión binocular, de manera que el aprendizaje ha sido significativo.
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    Refractive error study in young subjects: results from a rural area in Paraguay
    (International journal of ophthalmology, 2017) Signes Soler, Isabel; Hernández Verdejo, José Luis; Estrella Lumeras, Miguel Ángel; Tomás Verduras, Elena; Piñero, David Pablo
    AIM: To evaluate the distribution of refractive error in young subjects in a rural area of Paraguay in the context of an international cooperation campaign for the prevention of blindness. METHODS: A sample of 1466 young subjects (ranging from 3 to 22 years old), with a mean age of 11.21±3.63 years old, were examined to assess their distance visual acuity (VA) and refractive error. The first screening examination performed by trained volunteers, included visual acuity testing, autokeratometry and non-cycloplegic autorefraction. Inclusion criteria for a second complete cycloplegic eye examination by an optometrist were VA <20/25 (0.10 logMAR or 0.8 decimal) and/or corneal astigmatism ≥1.50 D. RESULTS: An uncorrected distance VA of 0 logMAR (1.0 decimal) was found in 89.2% of children. VA <20/25 and/or corneal astigmatism ≥1.50 D was found in 3.9% of children (n=57), with a prevalence of hyperopia of 5.2% (0.2% of the total) in this specific group. Furthermore, myopia (spherical equivalent ≤-0.5 D) was found in 37.7% of the refracted children (0.5% of the total). The prevalence of refractive astigmatism (cylinder ≤-1.50 D) was 15.8% (0.6% of the total). Visual impairment (VI) (0.05≤VA≤0.3) was found in 12/114 (0.4%) of the refracted eyes. Main causes for VI were refractive error (58%), retinal problems (17%, 2/12), albinism (17%, 2/12) and unknown (8%, 1/12). CONCLUSION: A low prevalence of refractive error has been found in this rural area of Paraguay, with higher prevalence of myopia than of hyperopia.