Peripheral extent of the choroidal circulation by ultra-widefield indocyanine green angiography in healthy eyes.

AIM: To analyse the peripheral extent of choroidal circulation using ultra-widefield (UWF) indocyanine green angiography (ICGA) in healthy eyes. METHODS: UWF ICGA images of 55 eyes of 36 healthy subjects were captured using the Optos California (Optos, Dunfermline, United Kingdom) in this prospective observational study. Images were analysed to locate the peripheral extent of the visible choroidal circulation, and the boundary was marked in ImageJ (v1.52). Each pixel annotated as the border of the choroidal circulation was projected individually to its anatomically correct location on the three-dimensional model eye, and spherical trigonometry was applied (using the Optos software) to calculate its respective radial distance from the centre of the optic disc in metric units (corrected by stereographic projection) for each quadrant. RESULTS: The mean area of the peripheral extent was estimated to be 893.2 mm2 (95% CI: 844.2 to 942.3 mm2). The mean distance (range) of this boundary from optic nerve centre was 18.22 mm (95% CI: 14.0 to 23.14 mm). Multiple regression analysis with age, gender, axial length or ethnicity showed no relationship. There was excellent inter-grader reproducibility, with intraclass correlation coefficients of 0.95 (95% CI: 0.80 to 0.99, p<0.001) for distance and 0.99 (95% CI: 0.988 to 0.999, p<0.001) for area measurements. CONCLUSIONS: The peripheral choroidal boundary may be defined using UWF ICGA. Knowledge of the normal extent and its variability is essential to understand the impact of disease on the choroidal vasculature.

Distribution and Location of Vortex Vein Ampullae in Healthy Human Eyes as Assessed by Ultra-Widefield Indocyanine Green Angiography.

PURPOSE: To study the number and distribution of vortex ampullae in healthy eyes using ultra-wide field (UWF) indocyanine green angiography (ICGA). DESIGN: Prospective, observational study. PARTICIPANTS: Thirty-six eyes of 36 healthy participants with no evidence of ocular or systemic disease. METHODS: The UWF ICGA images (central and peripheral steered) were captured using the Optos California (Optos, Dunfermline, United Kingdom) instrument. The images were projected stereographically to correct for peripheral distortion and obtain accurate measurements. All images were graded and analyzed for number, location, and distance of the vortex vein ampullae from the center of optic nerve. MAIN OUTCOME MEASURES: Mean number and the distance of ampullae from the center of optic nerve in all quadrants. RESULTS: The mean number of ampullae observed by UWF ICGA was 8.0±2.1 (range, 5-13). The mean distance of a vortex vein ampulla from the optic nerve was 14.2±1.1 mm (range, 10.3-17.7 mm). The frequency of ampullae was higher in the superior and inferior quadrants than the nasal and temporal quadrants. Ampullae were never observed in the 3- or 9-o'clock meridians. Multiple regression analysis showed no relationship with age, gender, axial length, or ethnicity. Excellent intergrader reproducibility was found between graders with an intraclass correlation coefficient (distance measurements: intraclass correlation coefficient, 0.99; 95% CI, 0.979-0.999; P < 0.001; number of ampullae: intraclass correlation coefficient, 0.99; 95% CI, 0.988-0.999; P < 0.001). CONCLUSIONS: The number of discrete vortex vein ampullae that can be discerned by UWF ICGA in healthy individuals is greater frequently and substantially than the 4 that are traditionally thought to drain the major quadrants. Considerable variability in the number and position of the ampullae may be apparent in healthy individuals.

Metamotivational knowledge of the role of high-level and low-level construal in goal-relevant task performance.

Metamotivation research suggests that people may be able to modulate their motivational states strategically to secure desired outcomes (Scholer & Miele, 2016). To regulate one's motivational states effectively, one must at minimum understand (a) which states are more or less beneficial for a given task and (b) how to instantiate these states. In the current article, we examine to what extent people understand the self-regulatory benefits of high-level versus low-level construal (i.e., motivational orientations toward abstract and essential vs. concrete and idiosyncratic features). Seven experiments revealed that participants can distinguish tasks that entail high-level versus low-level construal. Further, participants recognized the usefulness of preparatory exercises with which to instantiate high-level versus low-level construal for task performance, and this knowledge predicted behavioral choices. This research highlights novel insights that the metamotivational approach offers to research on construal level theory and, more broadly, to the study of self-regulation. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

Knowledge of the self-control benefits of high-level versus low-level construal.

Research indicates that inducing high-level construal (processing that highlights invariant, essential features) relative to low-level construal (processing that highlights idiosyncratic, peripheral features) promotes self-control (Fujita & Carnevale, 2012). In the present work, we investigate to what extent people recognize the self-control benefits of high-level construal, and explore the consequences of this knowledge. Studies 1 and 2 provide initial evidence that individuals are aware that high-level relative to low-level construal promotes self-control in the dieting domain. Studies 3 and 4 find that individual differences in this knowledge predict self-control success outcomes (i.e., body mass index) among those who are motivated by dieting goals. Examining academics as a domain of self-control, Study 5 demonstrates that those with higher knowledge of construal level's impact on self-control earned higher end-of-semester grades to the extent that they were motivated to do well academically. Theoretical and practical implications of these findings are discussed. (PsycINFO Database Record