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Papers by Eduardo Maidana

Investigative Ophthalmology & Visual Science, 2006

Journal of Pediatric Ophthalmology & Strabismus, 2007

To describe ultrasonographic findings of stages 4 and 5 retinopathy of prematurity. Ocular ultras... more To describe ultrasonographic findings of stages 4 and 5 retinopathy of prematurity. Ocular ultrasonography was performed using a 10-MHz transducer. Forty-four patients (88 eyes) with stages 4 and 5 retinopathy of prematurity were evaluated. Twenty-five patients were female. The mean age was 8.4 months (standard deviation, +/- 4.9). Retinal detachment configurations were as follows: 31% closed posterior and open anterior, 19% closed posterior and anterior, 14% open posterior and anterior, and 14% open posterior and closed anterior. Additional findings included vitreous opacities (14%), proliferative vitreoretinopathy (22%), subretinal opacities (24%), choroidal thickening (18%), and reduced axial diameter (75%). Ultrasonographic evaluation in eyes with advanced retinopathy of prematurity guides surgical indication, management, and visual prognosis.

Eye & Contact Lens: Science & Clinical Practice, 2007

Purpose. To report the first documented case series of bubbles and corneal dimples associated wit... more Purpose. To report the first documented case series of bubbles and corneal dimples associated with corneal reshaping after the first overnight wear of an orthokeratology lens. Methods. Three cases of transient corneal dimples are described after the first overnight use of the Be Free orthokeratology lens (BE; Ultravision Pty. Ltd., Brisbane, Australia) related to bubble formation under the posterior lens surface. Results. The corneal dimples were located most centrally and peripherally in correspondence to the reverse curve and did not produce a significant change in best-corrected visual acuity except in one patient, who had many bubbles in the central cornea. Conclusions. The current findings suggest that the precorneal tear film between the corneal surface and the posterior orthokeratology contact lens surface plays a role in the development of bubbles and corneal dimples.

American Journal of Ophthalmology, 2007

Journal of Refractive Surgery, 2009

PURPOSE: To present the prospective application of the Orbscan II central 2-mm total-mean corneal... more PURPOSE: To present the prospective application of the Orbscan II central 2-mm total-mean corneal power obtained by quantitative area topography in intraocular lens (IOL) calculation after refractive surgery. METHODS: Calculated and achieved refraction and the difference between them were studied in 77 eyes of 61 patients with previous radial keratotomy (RK), RK and additional surgeries, myopic LASIK, myopic photorefractive keratectomy (PRK), or hyperopic LASIK who underwent phacoemulsifi cation without complications in 3 eye centers. All IOL calculations used the average from the central 2-mm Orbscan II total-mean power of maps centered on the pupil without the use of previous refractive data. Six IOL styles implanted within the bag were used. RESULTS: Using the SRK-T formula, the overall calculated refraction was Ϫ0.64Ϯ0.93 diopters (D). The overall achieved spherical equivalent refraction (Ϫ0.52Ϯ0.79 D) was Ϯ1.00 D in 78% of eyes and Ϯ2.00 D in 99% of eyes. The overall difference between the calculated and achieved refraction (0.12Ϯ0.93 D, P=.27) was Ϯ1.00 D in 77% of eyes and Ϯ2.00 D in 96% of eyes. This difference was Ϯ1.00 D in 77% of eyes with RK (P=.70) and in 90% of eyes with myopic LASIK (P=.34) or myopic PRK (P=.96). In eyes with RK followed by LASIK, a trend toward undercorrection was noted (P=.03). In eyes with hyperopic LASIK, a trend toward overcorrection was noted (P=.005). CONCLUSIONS: In eyes with previous corneal refractive surgery, IOL power calculation can be performed with reasonable accuracy using the Orbscan II central 2-mm total-mean power. This method had better outcomes in eyes with previous RK, myopic LASIK, and myopic PRK than in eyes with hyperopic LASIK or RK with LASIK.

Arquivos Brasileiros de …, 2005

Nota Editorial: Depois de concluída a análise do artigo sob sigilo editorial e com a anuência do ... more Nota Editorial: Depois de concluída a análise do artigo sob sigilo editorial e com a anuência do Dr. José Américo Bonatti sobre a divulgação de seu nome como revisor, agradecemos sua participação neste processo.

American Journal of Ophthalmology, 2007

Investigative Ophthalmology & Visual Science, 2006

Journal of Pediatric Ophthalmology & Strabismus, 2007

To describe ultrasonographic findings of stages 4 and 5 retinopathy of prematurity. Ocular ultras... more To describe ultrasonographic findings of stages 4 and 5 retinopathy of prematurity. Ocular ultrasonography was performed using a 10-MHz transducer. Forty-four patients (88 eyes) with stages 4 and 5 retinopathy of prematurity were evaluated. Twenty-five patients were female. The mean age was 8.4 months (standard deviation, +/- 4.9). Retinal detachment configurations were as follows: 31% closed posterior and open anterior, 19% closed posterior and anterior, 14% open posterior and anterior, and 14% open posterior and closed anterior. Additional findings included vitreous opacities (14%), proliferative vitreoretinopathy (22%), subretinal opacities (24%), choroidal thickening (18%), and reduced axial diameter (75%). Ultrasonographic evaluation in eyes with advanced retinopathy of prematurity guides surgical indication, management, and visual prognosis.

Eye & Contact Lens: Science & Clinical Practice, 2007

Purpose. To report the first documented case series of bubbles and corneal dimples associated wit... more Purpose. To report the first documented case series of bubbles and corneal dimples associated with corneal reshaping after the first overnight wear of an orthokeratology lens. Methods. Three cases of transient corneal dimples are described after the first overnight use of the Be Free orthokeratology lens (BE; Ultravision Pty. Ltd., Brisbane, Australia) related to bubble formation under the posterior lens surface. Results. The corneal dimples were located most centrally and peripherally in correspondence to the reverse curve and did not produce a significant change in best-corrected visual acuity except in one patient, who had many bubbles in the central cornea. Conclusions. The current findings suggest that the precorneal tear film between the corneal surface and the posterior orthokeratology contact lens surface plays a role in the development of bubbles and corneal dimples.

American Journal of Ophthalmology, 2007

Journal of Refractive Surgery, 2009

PURPOSE: To present the prospective application of the Orbscan II central 2-mm total-mean corneal... more PURPOSE: To present the prospective application of the Orbscan II central 2-mm total-mean corneal power obtained by quantitative area topography in intraocular lens (IOL) calculation after refractive surgery. METHODS: Calculated and achieved refraction and the difference between them were studied in 77 eyes of 61 patients with previous radial keratotomy (RK), RK and additional surgeries, myopic LASIK, myopic photorefractive keratectomy (PRK), or hyperopic LASIK who underwent phacoemulsifi cation without complications in 3 eye centers. All IOL calculations used the average from the central 2-mm Orbscan II total-mean power of maps centered on the pupil without the use of previous refractive data. Six IOL styles implanted within the bag were used. RESULTS: Using the SRK-T formula, the overall calculated refraction was Ϫ0.64Ϯ0.93 diopters (D). The overall achieved spherical equivalent refraction (Ϫ0.52Ϯ0.79 D) was Ϯ1.00 D in 78% of eyes and Ϯ2.00 D in 99% of eyes. The overall difference between the calculated and achieved refraction (0.12Ϯ0.93 D, P=.27) was Ϯ1.00 D in 77% of eyes and Ϯ2.00 D in 96% of eyes. This difference was Ϯ1.00 D in 77% of eyes with RK (P=.70) and in 90% of eyes with myopic LASIK (P=.34) or myopic PRK (P=.96). In eyes with RK followed by LASIK, a trend toward undercorrection was noted (P=.03). In eyes with hyperopic LASIK, a trend toward overcorrection was noted (P=.005). CONCLUSIONS: In eyes with previous corneal refractive surgery, IOL power calculation can be performed with reasonable accuracy using the Orbscan II central 2-mm total-mean power. This method had better outcomes in eyes with previous RK, myopic LASIK, and myopic PRK than in eyes with hyperopic LASIK or RK with LASIK.

Arquivos Brasileiros de …, 2005

Nota Editorial: Depois de concluída a análise do artigo sob sigilo editorial e com a anuência do ... more Nota Editorial: Depois de concluída a análise do artigo sob sigilo editorial e com a anuência do Dr. José Américo Bonatti sobre a divulgação de seu nome como revisor, agradecemos sua participação neste processo.

American Journal of Ophthalmology, 2007