Cataract, strabismus and chorioretinal coloboma in paediatric HIV infection

Both figures show that the centre of the lenses (devoted to far distance) does not reach the nominal distance power of the lens (−3.0 D), being slightly more positive. A higher nominal power of the lenses implies a higher addition, however, this may impact on distance vision. Therefore, this positive over-correction (around 0.5 D) should be taken into consideration by clinicians at the moment of prescribing the nominal power of these lenses. Finally, it should be mentioned that a decentration of these annular designs could alter their optical performance.7 Hence, after the current analysis it is clear that the studies that will analyse the effectiveness of these lenses on myopia progression should properly control two parameters: the pupil dynamic of the patients and the centration of the lenses. 2. Anstice NS, Phillips JR. Effect of dual-focus soft contact le wear on axial myopia progression in children. Ophthalmolog 2011;118:1152--1161. 3. Tarrant J, Severson H, Wildsoet CF. Accommodation emmetropic and myopic young adults wearing bifocal so contact lenses. Ophthal Physiol Opt. 2008;28:62--72. 4. Papas E, Dahms A, Carnt N, Tahhan N, Ehrmann K. Power profil and short-term visual performance of soft contact lenses. Opto Vis Sci. 2009;86:318--323. 5. Chen Z, Niu L, Xue F, et al. Impact of pupil diamet on axial growth in orthokeratology. Optom Vis Sci. 2012;8 1636--1640. 6. Plainis S, Atchison DA, Charman WN. Power profiles of mult focal contact lenses and their interpretation. Optom Vis Sc 2013;90:1066--1077. 7. Kim E, Bakaraju RC, Ehrmann K. Reliability of power profil