Challenging the current treatment of residual postoperative ptosis: safety and efficacy of repeat Müller's muscle conjunctival resection.

OBJECTIVE: To determine if repeat Müller's muscle conjunctival resection (MMCR) is a viable approach in the treatment of recurrent or residual eyelid ptosis. METHODS: A retrospective review of patients who underwent repeat MMCR was performed using external photos obtained preoperatively, postoperatively, and at last follow-up. The marginal reflex distances (MRD1 and MRD2), brow position (BP), and tarsal platform show (TPS) were evaluated with digital image analysis. The change in upper eyelid height (MRD1) and TPS following repeat ptosis repair were the outcome measures. RESULTS: Repeat MMCR was performed on 12 eyelids of 11 patients. Mean MRD1 elevation after initial MMCR was 1.6 mm (standard deviation [SD] = 1.0mm, p < 0.00001). Mean decrease in TPS was 1.9 mm (p = 0.04). There was no significant change in MRD2 (p = 0.36) or BP (p = 0.33) with initial MMCR. Mean interval between procedures was 12.8 months (range 2.3-48.0) and follow-up after repeat MMCR was 2.3 months. Total average follow-up after initial MMCR was 15.1 months. Mean elevation in MRD1 after repeat MMCR was 1.0 mm (SD = 0.8 mm, p < 0.002). Mean decrease in TPS was 1.0 mm (p = 0.03). There was no difference in MRD2 (p = 0.90) or BP (p = 0.53). There were no complications of repeat MMCR noted clinically or spontaneously reported, including no entropion, fornix foreshortening, or development of dry eye signs or symptoms. CONCLUSION: Repeat MMCR significantly improves recurrent or residual ptosis after initial MMCR without significant adverse consequences. The degree of elevation with repeat MMCR was diminished when compared with initial MMCR.

Refractive index and its impact on pseudophakic dysphotopsia.

PURPOSE: It has been shown that the biggest dissatisfier for uncomplicated cataract surgery patients is pseudophakic dysphotopsia (PD). While edge design of an intraocular lens (IOL) impacts this problem, refractive index is still controversial as to its impact. This retrospective cohort study was designed to determine the role of increasing refractive index in PD. PATIENTS AND METHODS: This study was conducted at the John A. Moran Eye Center, University of Utah, USA. A retrospective chart review identified patients who received one of two hydrophobic acrylic single piece IOLs (AcrySof WF SP [SN60WF] or Tecnis SP [ZCB00]), which differed mainly by refractive index (1.55 versus 1.47). Eighty-seven patients who had received implantation of a one-piece hydrophobic acrylic IOL were enrolled. Patients were included if the surgery had been uncomplicated and took place at least a year before study participation. All eligible patients had 20/20 best corrected vision, without any disease known to impact visual quality. In addition to conducting a record review, the enrolled patients were surveyed for PD, using a modified National Eye Institute Visual Function questionnaire, as well as for overall satisfaction with visual quality. RESULTS: Statistical analysis demonstrated no difference between the two cohorts regarding PD, general visual function, and overall visual satisfaction. CONCLUSION: The study suggests that with the two IOLs assessed, increasing the refractive index does not increase incidence of PD or decrease overall visual satisfaction.

Porcine lens nuclei as a model for comparison of 3 ultrasound modalities regarding efficiency and chatter.

PURPOSE: To validate a porcine lens model by comparing density and ultrasound (US) with known human standards using the Infiniti Ozil with Intelligent Phacoemulsification (torsional), Whitestar Signature Micropulse (longitudinal), and Ellips FX (transversal) modalities. SETTING: Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. DESIGN: Experimental study. METHODS: Lens nuclei were formalin soaked in hour-based intervals and divided into 2.0 mm cubes. Density was characterized by crushing experiments and compared with known human measures. Efficiency and chatter were examined. RESULTS: The mean weight to cut thickness in half ranged from 16.9 g ± 5.5 (SD) in the 0-hour group to 121.3 ± 47.5 gm in the 4-hour group. Lenses in the 2-hour group (mean 70.2 ± 19.1 g) best matched human density (P=.215). The mean efficiency ranged from 0.432 ± 0.178 seconds to 9.111 ± 2.925 seconds; chatter ranged from zero to 1.85 ± 1.927 bounces. No significant difference was detected when comparing the 2-hour formalin group with human lenses in torsional and transversal US. There was no significant difference between transversal and torsional modalities, consistent with human studies. Although longitudinal (6 milliseconds on, 12 milliseconds off) was significantly more efficient at 50% power than at 25%, there was no significant difference compared with transversal or torsional US. CONCLUSIONS: Animal lenses soaked for 2 hours in formalin were most comparable to human lenses. Longitudinal US may be an acceptable alternative to torsional and transversal US.