A novel wearable sensor for objective measurement of distance and illumination.

IF 2.8 3区 医学 Q1 OPHTHALMOLOGY
Raman Prasad Sah, Pavan Kalyan Narra, Lisa A Ostrin
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引用次数: 0

Abstract

Purpose: To evaluate the rangefinding and light sensing capabilities of a novel wearable sensor, the Visual Environment Evaluation Tool (VEET) developed for myopia research.

Methods: The VEET 1.0 (Meta, LLC) is a temple-integrated system mounted on a spectacle frame. Both the left and right temples house four sensors each, angled straight ahead and 20° downward/4° nasal, respectively. For validation, VEET-mounted spectacles were placed on a mannequin head. An infrared camera was used to capture the spatial characteristics of the rangefinding beam. Distance measurements were collected against a wall for 5-400 cm. The accuracy of distance measurements for different target types, sizes and tilt was assessed. Ambient illumination was captured in different indoor and outdoor settings and compared to a lux meter.

Results: All devices (N = 20) were capable of capturing distances for the full range evaluated, 5-400 cm, against a wall. There was a strong relationship between the actual and measured distances, with a slope of 1.01 ± 0.003 and 0.95 ± 0.007, for the left and right temples, respectively. Distance measurements were repeatable across different target types, including paper and tablet. Mean beam diameter of five tested devices was 52.2° ± 7.5°. The VEET effectively measured distances across different target sizes, ranging from 2 × 2 cm and larger and target tilt ±60°. Illumination measurements across different indoor and outdoor settings demonstrated a strong linear relationship with lux meter readings (R2 = 0.99 and 0.78 for the left and right temples, respectively), effectively distinguishing indoor (<1000 lux) and outdoor (≥1000 lux) illumination levels.

Conclusion: The VEET provides accurate quantification of real-time distances across different target types and sizes and is capable of effectively distinguishing indoor and outdoor illumination levels. The VEET will be valuable in studies evaluating risk factors for myopia to gain a better understanding of the role of near work and light exposure.

一种用于客观测量距离和照明的新型可穿戴传感器。
目的:为评估一种新型可穿戴传感器的测距和光传感能力,开发了用于近视研究的视觉环境评估工具(VEET)。方法:VEET 1.0 (Meta, LLC)是一种安装在眼镜架上的寺庙集成系统。左右太阳穴各有四个传感器,分别垂直向前和向下20°/鼻部4°。为了验证,将veet安装的眼镜放在人体模型的头上。利用红外摄像机捕捉测距波束的空间特征。距离测量靠墙收集5-400厘米。评估了不同靶型、大小和倾斜度的距离测量精度。在不同的室内和室外环境中捕捉环境照明,并与勒克斯计进行比较。结果:所有装置(N = 20)都能够在全评估范围内捕获距离,5-400 cm,靠墙。左太阳穴和右太阳穴的实际距离和测量距离之间存在很强的相关性,斜率分别为1.01±0.003和0.95±0.007。距离测量在不同的目标类型上是可重复的,包括纸张和平板电脑。5个测试装置的平均光束直径为52.2°±7.5°。VEET有效地测量了不同目标尺寸的距离,范围从2 × 2 cm及更大,目标倾斜±60°。不同室内和室外环境下的照度测量值与勒克斯计读数呈强线性关系(R2分别为0.99和0.78),有效区分室内(结论:VEET提供了不同目标类型和大小的实时距离的准确量化,能够有效区分室内和室外照明水平。VEET将在评估近视风险因素的研究中有价值,以更好地了解近距离工作和光照的作用。
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来源期刊
CiteScore
5.10
自引率
13.80%
发文量
135
审稿时长
6-12 weeks
期刊介绍: Ophthalmic & Physiological Optics, first published in 1925, is a leading international interdisciplinary journal that addresses basic and applied questions pertinent to contemporary research in vision science and optometry. OPO publishes original research papers, technical notes, reviews and letters and will interest researchers, educators and clinicians concerned with the development, use and restoration of vision.
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