Free Papers

Combining questionnaires and simulators for assessing Dysphotopsia: pilot design of a new app

Free Paper Details

First Author: J.Fernandez SPAIN

Co Author(s):    M. Rodríguez-Vallejo   N. Burguera   N. Garzón   E. Ordiñaga-Monreal   C. Albarrán   I. Basterra     

Abstract Details

Purpose:

To review the scientific literature from 1985 up to 2020 about Dysphotopsia for designing a new iPad application considering the domains usually included in the questionnaires used by Multifocal Intraocular Lens (MIOLs) studies and to combine a new set of questions with a simulator of some photic phenomena (PP) around an oncoming car headlight. Five domains were included: halo, glare, starburst, other short time PP and negative dysphotopsia.

Setting:

Qvision, Ophthalmology Department Vithas Virgen del Mar Hospital

Methods:

Three stages were included: (1) yes/not experiencing the PP using a static image for improving comprehension (2) grading with a simulator the size, intensity and width for halo and the first two for glare and starburst (3) judging how bothersome was the PP, evaluated with a five-level Likert scale. A simulated combined image for subjects who experienced more than one PP was also used and subjects were asked about how similar was to their real experience and how bothersome was the combination. 26 subjects implanted with MIOLs and 26 controls were evaluated.

Results:

Only halo obtained significant differences between control (46.2%) and MIOL (88.5%) for yes/not experiencing the PP (p=0.001). No differences were obtained for bothersome between subjects who experimented any PP between groups. For the simulator parameters, only Intensity for Halo and Glare was significantly different between control (0.59 and 0.52) and MIOL (0.73 and 0.74). The simulator combined image was graded as moderately or very similar to the real experience for 62% of controls and 59% of MIOLs. Intensity for each one of the PP was the parameter with the highest statistical power, the remaining parameters of the simulator had very low power.

Conclusions:

Controls also reported experimenting Halo, Glare and Starburst and the only difference with MIOLs was the rates of experiencing the Halo that doubled the control cases. For subjects who experimented any PP in the control group, this was as bothersome and equally graded by the simulator than in MIOLs with exception of intensity which was higher in the MIOLs group. This corresponds to a pilot study conducted during the design of the App, an improvement of design is required according to the current evidence before to start the validation process with higher sample sizes.

Financial Disclosure:

-