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. 2020 Aug 1:2020:1037689.
doi: 10.1155/2020/1037689. eCollection 2020.

Portable Handheld Slit-Lamp Based on a Smartphone Camera for Cataract Screening

Shenming Hu  1   2   3 , Hong Wu  4 , Xinze Luan  3 , Zhuoshi Wang  2 , Mary Adu  3 , Xiaoting Wang  3 , Chunhong Yan  2 , Bo Li  4 , Kewang Li  4 , Ying Zou  4 , Xiaoya Yu  4 , Xiangdong He  5 , Wei He  1
Affiliations

Portable Handheld Slit-Lamp Based on a Smartphone Camera for Cataract Screening

Shenming Hu et al. J Ophthalmol. .

Abstract

Purpose: As part of plans to provide help to people in remote and poor areas who have no medical resources, a portable slit-lamp based on a smartphone was proposed. This would help in early screening of cataract diseases.

Methods: This means a microlens is designed that would work with a phone's camera. The phone's photo taking function is used in capturing the image of the eyes lens to replace the observation system of the desktop slit-lamp. A simplified slit light band was designed. In order for the light source part to meet the portable requirements of the slit-lamp, the adjustable and diffused light functions of the ligaments were removed in this design. Furthermore, the images collected by the smartphone are uploaded to the deep learning cataract screening system, which can achieve real-time and effective screening of cataract.

Results: Unlike the desktop slit-lamp, which needs skilled personnel to operate, this device can be easily operated by less-skilled or inexperienced doctors. This eliminates the concerns of inaccurate diagnosis based on the use of unskilled professionals. Due to the portability, ease of use, and simplicity in obtaining crystal images of this device, it serves as a promising platform for nonhospital screening and telemedicine.

Conclusions: In this paper, we invented a small portable device for screening cataract. This device is to make screening and diagnosis of cataract in remote areas very fast and effective. It will also solve the problem of inadequate specialized doctors and equipment in those areas as well. Translational Relevance. Smartphones can be used with portable slit-lamps to capture the images of the lens.

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Conflict of interest statement

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Figures

Figure 1
Figure 1
(a) Table-type slit-lamp. (b) Handheld slit-lamp.
Figure 2
Figure 2
Smartphone slit-lamp installed on a smartphone.
Figure 3
Figure 3
(a) Smartphone slit-lamp components. (b) Smartphone slit-lamp model diagram. (c) Slit light source.
Figure 4
Figure 4
Microlens light path.
Figure 5
Figure 5
(a) An MTF view of a microlens with an MTF greater than 0.2 over the entire field of view at 60 HZ. (b) Scatter plot showing spot size of lens near diffraction limit.
Figure 6
Figure 6
(a) Schematic diagram of slit-lamp use. (b) Screening of cataract diseases in Africa.
Figure 7
Figure 7
Example diagram of smartphone slit-lamp judging the category of eye crystals.
See this image and copyright information in PMC

References

    1. Hall N. F., Lempert P., Zakir R. P., Phillips D. Grading nuclear cataract: reproducibility and validity of a new method. British Journal of Ophthalmology. 1999;83(10):1159–1163. doi: 10.1136/bjo.83.10.1159. - DOI - PMC - PubMed
    1. Shier L. T., Wolfe J. K., Singer D. M., et al. The lens opacities classification system III. Archives of Ophthalmology. 1993;111(6):831–836. doi: 10.1001/archopht.1993.01090060119035. - DOI - PubMed
    1. Li H., Lim J. H., Liu J., et al. An automatic diagnosis system of nuclear cataract using slit-lamp images. Proceedings of the 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society; September 2009; Minneapolis, MN, USA. pp. 3693–3696. - DOI - PubMed
    1. Fan S., Dyer C. R., Hubbard L., et al. An Automatic System for Classification of Nuclear Sclerosis from Slit-Lamp Photographs. Berlin, Germany: Springer; 2003.
    1. Kaur M., Kaur J., Kaur R. Low cost cataract detection system using smartphone. Proceedings of the International Conference on Green Computing & Internet of Things; October 2015; Noida, India. IEEE; - DOI