ABSTRACT
OBJECTIVE: Revision of methods for estimating corneal power (Kpost) and effective lens position (ELP) for cataract surgery after corneal refractive surgery. METHODS: Review of medical literature. RESULTS: To calculate the intraocular lens that achieves emetropia after corneal refractive surgery it is necessary to correct the Kpost and to estimate the effective lens position again correcting it. There are different formulae depending on the available information. Ideally, we need pre (Kpre) and post-treatment keratometry record (Kpost) and pre (Rpre) and post (Rpost) refraction. In this way, we can use the Aramberri's double-K method in the formula for calculating intraocular lens power. CONCLUSIONS: Previously to keratorefractive procedure is advisable to have pre-treatment refraction and keratometry (K and method) registered: Kpre value is critical to calculate the ELP.
Subject(s)
Lenses, Intraocular , Photorefractive Keratectomy , Humans , Lens Implantation, Intraocular , MathematicsABSTRACT
Objetivo: Revisión de las distintas fórmulas decorrección del poder refractivo de la córnea (Kpost)y de la estimación de la posición efectiva de la lente(ELP) para la cirugía de cataratas después decirugía refractiva corneal.Método: Revisión de la literatura médica.Resultados: Es necesario realizar una correcciónde la Kpost para el cálculo de la lente intraoculartras cirugía refractiva. Existen diferentes víasdependiendo de la información disponible. Paraestimar la ELP es necesario realizar una nuevacorrección. Es aconsejable disponer de la queratometríaprevia (Kpre) y posterior (Kpost) a la cirugíay la refracción previa (Rpre) y posterior (Rpost). Deesta manera, podremos realizar la corrección doble-K de Aramberri en la fórmula de cálculo.Conclusiones: Es conveniente registrar la refraccióny queratometría (K, y método) previamente ala cirugía refractiva: la Kpre es crítica para el cálculo de la ELP(AU)
Objective: Revision of methods for estimating cornealpower (Kpost) and effective lens position(ELP) for cataract surgery after corneal refractivesurgery.Methods: Review of medical literature.Results: To calculate the intraocular lens thatachieves emetropia after corneal refractive surgeryit is necessary to correct the Kpost and to estimatethe effective lens position again correcting it. Thereare different formulae depending on the availableinformation. Ideally, we need pre (Kpre) and posttreatmentkeratometry record (Kpost) and pre(Rpre) and post (Rpost) refraction. In this way, wecan use the Aramberris double-K method in theformula for calculating intraocular lens power.Conclusions: Previously to keratorefractive procedureis advisable to have pre-treatment refractionand keratometry (K and method) registered: Kprevalue is critical to calculate the ELP(AU)
Subject(s)
Humans , Male , Female , Lenses, Intraocular , Refractive Surgical Procedures , Refractive Surgical Procedures/methods , Cataract , Cataract/therapy , Cataract Extraction , Cataract Extraction/methods , Databases, BibliographicABSTRACT
PURPOSE: We evaluated the efficacy of topical brimonidine in visual field preservation and/or improvement in eyes undergoing controlled glaucoma. METHODS: Seventy eyes of patients were trained with two different visual field test strategies: The Octopus Tendency Oriented Perimetry (TOP) G1 and the Frequency Doubling Technology (FDT) 30 degrees. Following 2-4 months of brimonidine treatment, there were significant improvements in visual field, as assessed using the TOP G1 strategy (p = 0.003). The FDT 30 degrees test revealed no statistically significant differences. CONCLUSIONS: These data support the results of other studies, which indicate that brimonidine may increase mean sensitivity in visual field tests. Since it is known that the control of intraocular pressure does not fully protect glaucomatous eyes from visual field loss, it is possible that the neuroprotective qualities of brimonidine may contribute to visual field preservation in glaucomatous eyes.
Subject(s)
Adrenergic alpha-2 Receptor Agonists , Adrenergic alpha-Agonists/administration & dosage , Glaucoma/drug therapy , Quinoxalines/administration & dosage , Visual Fields/drug effects , Administration, Topical , Adult , Aged , Aged, 80 and over , Brimonidine Tartrate , Female , Humans , Intraocular Pressure/drug effects , Male , Middle Aged , Ophthalmic Solutions , Visual Field TestsABSTRACT
We applied diode laser energy through a fiberoptic probe to cut ocular structures. The diameter of the probe's tip was 100 microns. The amount of energy used for cutting the lid, the cornea, or for perforation of the glove was 2.5 watts in the continuous mode. The incised border demonstrated coagulation into the healthy tissue ranging from 10 to 50 microns.