196,009 research outputs found
Applicazione di membrana amniotica nelle gravi alterazioni della superficie oculare: nostra casistica.
No full textComparison between penetrating and deep anterior lamellar keratoplasty in the treatment of keratoconus: a study in the fellow eyes
No full textCorrelation between central thickness of residual bed and contrast sensitivity and visual acuity after deep lamellar keratoplasty.
No full textComparison of two multifocal intraocular lens designs that differ only in near add.
No full textPURPOSE: To evaluate monocular functional outcomes after the implantation of the AcrySof ReSTOR SN6AD2 intraocular lens (IOL) (+2.5 diopters [D] near add) (Alcon Laboratories, Inc., Fort Worth, TX) and the AcrySof ReSTOR SN6AD1 IOL (+3.0 D near add) (Alcon Laboratories, Inc.).
METHODS: This prospective, comparative, nonrandomized single-blind observational study comprised 62 eyes of 62 patients that underwent phacoemulsification and implantation of a multifocal IOL: SN6AD2 (31 eyes) (+2.5 group) and SN6AD1 (31 eyes) (+3.0 group). Twelve months after surgery, monocular near (30 and 40 cm), intermediate (50, 60, and 70 cm), and distance (4 m) visual acuity were evaluated with the internal root mean square and modulation transfer function. Both parameters were evaluated at the 4- and 6-mm pupil sizes.
RESULTS: No statistical differences at 4 m were found between the groups. The +2.5 group obtained better performances at all intermediate distances (50 cm, 0.23 ± 0.14 vs 0.32 ± 0.13; 60 and 70 cm, 0.21 ± 0.10 vs 0.41 ± 0.14 and 0.24 ± 0.10 vs 0.53 ± 0.17, respectively), whereas the near visual acuity was better for the +3.0 group (30 and 40 cm, 0.36 ± 0.18 vs 0.14 ± 0.09 and 0.36 ± 0.19 vs 0.17 ± 0.07, respectively). The root mean square was lower for the +2.5 group compared to the +3.0 group, whereas the modulation transfer function showed overlapping results between the two models.
CONCLUSIONS: Both IOL models showed good results in distance vision; the +2.5 D IOL seemed to provide better intermediate vision than the +3.0 D IOL. For near vision, the +3.0 D model performed better than the +2.5 D model
Long-term Visual Function and Patient Satisfaction After Bilateral Implantation and Combination of Two Similar Multifocal IOLs
No full textPURPOSE: To evaluate the visual outcome, spectacle independence, and patient satisfaction after implantation of two Acrysof ReSTOR (Alcon Laboratories, Inc., Fort Worth, TX) intraocular lenses (IOLs) with different addition power or their combination in both eyes.METHODS: One hundred twenty eyes of 60 patients with bilateral multifocal IOL implantation were divided into three groups of 20 consecutive patients each: the SV25T0 (the T0 group), the SN6AD1 (the D1 group), or a combination of both the SN6AD1 and SV25T0 (the combined group). Patients were observed 18 months postoperatively for visual acuity (40, 50, and 60 cm, and 4 m), defocus curves (range: +1.0 to -4.0 diopters), and contrast sensitivity. Quality of vision, patient satisfaction, and spectacle independence were evaluated by the National Eye Institute Refractive Error Quality of Life Instrument-42 questionnaire.RESULTS: The D1 group achieved better results for near vision (P < .01), whereas the T0 group achieved better intermediate vision (P = .01). The combined group showed a wider range of spectacle independence at all distances evaluated (P < .05). The contrast sensitivity was similar within the groups. The incidence of glare was lower for the T0 group (P = .054). The combined group had better results in terms of expectation (P = .021) and activity limitation (P = .003).CONCLUSION: Although the bilateral implantation of the same multifocal IOL can maximize the vision for near or intermediate distances, the combination of these IOLs in both eyes can increase the range of spectacle independence without compromising the contrast sensitivity and quality of vision
Confronto fra HRT-3, OCT-Spectralis e GDx-VCC nella valutazione del danno del nervo ottico nel glaucoma primario ad angolo aperto.
No full text[no abstract available
The acoustic structure of wolf howls in some eastern Tuscany (central Italy) free ranging packs
No full textItalian wolf howls are described for the first time from observations between 2003-2008 of a population living in eastern Tuscany, central Italy. A sample of 37 howls selected among single responses and 128 howls included in the choruses of 7 free ranging packs was recorded and analysed. The mean fundamental frequency of the howls ranged between 274-908 Hz. Two main structures recognised by means of multivariate explorative analysis, in particular Principal Component and Cluster Analysis, were ascribed to breaking and flat howls. Discriminant Function Analysis was applied to the recognised groups with the aim to find a general rule for classification. Howls with different features were correctly assigned to the groups obtained by explorative analysis in 95.8% of cases. The analysis of the variables characterising the structure of the howls suggests that maximum frequency and range of fundamental frequency are the most important parameters for classification, while duration does not appear to play any significant role
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Higher order aberrations after keratoplasty for keratoconus.
No full textPURPOSE: To compare higher order aberrations (HOAs) caused by the anterior and posterior corneal surfaces after conventional penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK), and automated lamellar therapeutic keratoplasty (ALTK) in patients undergoing corneal transplantation for keratoconus (KC).
METHODS: This retrospective, observational, cross-sectional study included one eye of the following subjects: 40 patients with KC, 23 KC patients after PK, 17 KC patients after DALK, 18 KC patients after ALTK, and 38 healthy controls. All underwent imaging with a rotating Scheimpflug camera (at least 6 months after complete suture removal in grafted subjects) to assess the HOAs from the anterior and posterior corneal surfaces within the central 4-mm and 6-mm zones. The conversion of the corneal elevation profile into corneal wavefront data was performed using Zernike polynomials. Total and third- and fourth-order HOAs were considered. The root mean square of the Zernike vector magnitude, expressed in micrometers, was used. Differences among groups were assessed using the Kruskal-Wallis and Duncan multiple range tests. Statistical significance was defined as p < 0.05.
RESULTS: In both 4-mm and 6-mm central zones, the total HOAs from the anterior corneal surfaces were significantly lower in DALK than in ALTK and PK groups (p 0.05). The aberration components that were significantly greater included coma in the KC and ALTK eyes, trefoil and coma in the DALK eyes, and trefoil in the PK eyes.
CONCLUSIONS: The corneal anterior surface optical quality appeared significantly better after DALK than after ALTK and PK
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
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