Evaluation of nuclear cataract with smartphone-attachable slit-lamp device

Hiroyuki Yazu, Eisuke Shimizu, Sho Okuyama, Takuya Katahira, Naohiko Aketa, Ryota Yokoiwa, Yasunori Sato, Yoko Ogawa, Hiroshi Fujishima

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Background: Visual impairments and age-related eye diseases need to be detected and treated in a timely manner. However, this is often hampered by lack of appropriate medical equipment. We have invented a portable, recordable, and smartphone-attachable slit-lamp device, called the Smart Eye Camera (SEC). The aim of this study was to compare evaluating nuclear cataract (NUC) between the SEC and the conventional, non-portable slit-lamp microscope. Methods: A total of 128 eyes of 64 Japanese patients (mean age: 73.95 ± 9.28 years; range: 51-92 years; female: 34) were enrolled. The NUC was classified into four grades (grade 0 to 3) based on three standard photographs of nuclear opacities according to the WHO classification by ophthalmologists. An ophthalmic healthcare assistant (non-ophthalmologist) filmed the eyes in video mode by the SEC and an ophthalmologist graded the NUC. Grade correlation and inter-rater reproducibility were determined. Results: NUC grading by the two approaches correlated significantly (both eyes: r = 0.871 [95%CI: 0.821 to 0.907; p < 0.001]). Inter-rater agreement was high (weighted κ = 0.807 [95%CI: 0.798 to 0.816; p < 0.001]). Conclusions: This study suggests that the SEC is as reliable as the conventional non-portable slit-lamp microscope for evaluating NUC.

Original languageEnglish
Article number576
Issue number8
Publication statusPublished - 2020 Aug


  • Cataract
  • Conventional slit-lamp microscope
  • Portable
  • Recordable
  • Smart eye camera

ASJC Scopus subject areas

  • Clinical Biochemistry


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