Electronic contact lenses are used for noninvasively monitoring vital human signs and medical parameters. However, maintaining a secure communications connection and a self‐sustainable power source are still looming challenges. Herein, a proof‐of‐concept electronic contact lens is demonstrated that includes a spiral antenna with its wireless circuit unit for data telemetry, a rectifier circuit for power conditioning, and a micro‐light‐emitting diode (μLED) as a load. The spiral antenna with its rectifying circuit is designed considering operation in the industrial, scientific, and medical (ISM) band of 2.4 GHz. The spiral coil with an inner diameter of 10 mm, an outer diameter of 12 mm, and a wire width of 0.2 mm is fabricated on a donut‐shaped flexible polyimide substrate. For biocompatibility purposes, polyimide is used as the contact lens substrate and polydimethylsiloxane (PDMS) is used for encapsulation. A 3D‐printed eye model is developed for accurately shaping the curvature of the PDMS‐encapsulated contact lens. The reflection coefficient (S11) of the fabricated antenna is tested in different conditions and on an eye model to mimic the liquid condition of the human eye. In a wide range of conditions, a minimum of −20 dB reflection coefficient (S11) is obtained.

Purpose The present study aimed to investigate and compare the psychometric properties of the National Eye Institute Visual Functioning Questionnaire‐25 (NEI VFQ‐25) and the Visual Function Index‐14 (VF‐14) in a large sample of patients with cataracts. Methods A total of 1052 patients with bilateral age‐related cataracts were recruited in the study. Patients with other comorbidities that severely impacted vision were excluded. Participants completed the two questionnaires in random order. Classical test theory and Rasch analyses were used to assess the psychometric properties of the questionnaires. Results Complete data were obtained from 899 patients. The mean overall index score on the NEI VFQ‐25 was 76.1 ± 19.0, while that on the VF‐14 was 46.5 ± 15.0. Cronbach's α‐values for the NEI VFQ‐25 and VF‐14 were 0.89 and 0.95, respectively. Ceiling effects were observed on nine of the 12 subscales in the NEI VFQ‐25. The correlation between total scores on the NEI VFQ‐25 and VF‐14 was moderate (r = 0.600; p < 0.001), and subscales of the NEI VFQ‐25 were weakly or moderately correlated with the similar domains on the VF‐14. Rasch analysis revealed ordered category thresholds and sufficient person separation for both instruments, while the two questionnaires had critical deficiencies in unidimensionality, targeting and differential item functioning. Conclusion Neither the NEI VFQ‐25 nor VF‐14 is optimal for the assessment of vision‐related quality of life in typical Chinese patients with cataracts. The potential deficiencies of the questionnaires should be taken into consideration prior to application of the instruments or interpretation of the results.

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