No abstract

No abstract

Purpose We conducted a study to investigate: (1) deviations caused by retinal detachment (RD) repair; (2) correlation between visual acuity and the number of surgeries to deviation size; and (3) differences between deviations following scleral buckling (SB) and pars plana vitrectomy (PPV). Methods A retrospective analysis of patients with persistent binocular diplopia following RD repair. Magnitude of manifest deviation (|dev|) in the primary position (PP) and position of greatest deviation (maxDev) was calculated. LogMAR acuity and number of previous vitreoretinal procedures were correlated to |dev| in both PP and maxDev. Manifest |dev| were compared between SB and PPV groups. Results Twenty-five patients were identified. The median |dev| was 7 prism diopters (PD) in PP and 17 PD in maxDev. We found no association between number of surgeries or VA with |dev| in either the PP (r ¼ À0.18 and r ¼ 0.08) or maxDev (r ¼ À0.26 and r ¼ À0.05). Twelve patients underwent PPV: median |dev| in PP 6 PD and maxDev 9 PD. In the SB group: median |dev| in PP 8 PD and in maxDev 22 PD. |dev| in PP showed no significant differences between PPV and SB (U ¼ 63, P ¼ 0.41); however, |dev| in maxDev, showed that SB have significantly greater deviations (U ¼ 36.0, P ¼ 0.02). Conclusion We report the largest cohort of patients with symptomatic ocular motility defects following PPV. We show no association between VA or number of procedures to strabismus magnitude. Ocular deviations in maxDev are significantly greater after SB procedures.

Aim: To evaluate in a pilot study the use of a touchscreen test in very low birth weight (VLBW) children to explore aspects of visuo-motor behaviour, measuring spatial localisation. Results in VLBW subjects will be compared with those in children born at term. It will be investigated whether any deficits found were related to parental reports of visual function difficulties. Methods: A range of visual functions were measured and IQ estimated using subtests from a standardised test. Using a touch-screen monitor to record pointing positions, in task 1 subjects pointed to sequences of visual targets as soon as they appeared and in task 2 they pointed after a memory delay. Results: Thirty-seven VLBW subjects and 32 control subjects were recruited. On task 1 there was no difference in the pointing error magnitude between the groups. Although the errors of the VLBW group were more variable, this was not statistically significant after exclusion of VLBW subjects with IQ <70. However, on task 2 the VLBW group remembered fewer complete sequences, leading to significantly higher average pointing errors when data were averaged over all sequences. When pointing error was averaged over only correctly remembered sequences, there was again no difference between the groups. Conclusions: Our results indicate that pure spatial localisation in the absence of a memory load in VLBW children is comparable to the performance of children born at term. However, deficits are apparent in VLBW children when working memory is introduced, and this is consistent with the findings of other studies.