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Appropriate addition power for aphakic infants determined by a smart wearable device Clouclip
Xinting Liu1, Shuyun Wen1, Muhan Sun1
1National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, China.
Insights
Determining the correct addition power (ADD) for infants after cataract surgery is crucial for visual development. A new smart wearable device found that an ADD of +4.25 D is suitable for aphakic infants, with child height being a key factor.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Biomedical Engineering
Background:
- Accurate optical correction is vital for visual development in infants post-cataract surgery.
- Aphakic infants require specific addition power (ADD) for near vision, but obtaining this is challenging due to poor cooperation and lack of subjective feedback.
Purpose of the Study:
- To determine the appropriate ADD for aphakic infants using a novel smart wearable device.
- To investigate near viewing habits and influencing factors in aphakic infants.
Main Methods:
- A cross-sectional, observational pilot study involving 23 aphakic infants (6 months to 3.5 years).
- Infants wore a smart wearable device for 7 days to monitor real-life near viewing distance.
- Analysis of viewing habits and correlation with factors like height, age, and surgical history.
Main Results:
- Near viewing constituted 77.9% of the time.
- The median near viewing distance was 23.8 cm, corresponding to an ADD of +4.25 D.
- Child height positively correlated with near viewing distance (r=0.646, p=0.001); other factors showed no significant correlation.
Conclusions:
- A smart wearable device facilitated the determination of suitable ADD for aphakic infants, establishing it at +4.25 D.
- Child's height is a significant influencing factor for determining the appropriate ADD in aphakic infants.
Clinical Relevance:
It is particularly important to perform reasonable and effective optical correction to enable visual development after primary lens removal surgery for congenital cataracts. Aphakic infants need a suitable addition power of prescription (ADD) to help them focus on close visual objects.
Background:
It is challenging to obtain appropriate ADD power for infants due to poor cooperation and lack of subjective feedback. We aimed to determine the appropriate ADD for aphakic infants using a recently developed smart wearable device called Clouclip.
Methods:
The study was a cross-sectional, observational pilot study. Twenty-three aphakic infants (aged from 6 months to 3.5 years) were invited to wear a smart wearable device for 7 days consecutively to monitor the near viewing distance in real life. Viewing habits and its associations with the possible influencing factors were investigated based on the data obtained from the device.
Results:
The average proportion of near viewing time was 77.9% (95% confidence interval (CI) 72.1-83.7%). The average of the median near viewing distance was 23.8 cm (95% CI 20.6 cm-27.0 cm), which corresponded to an ADD of +4.25 D (95% CI + 3.75 D - +4.75 D) spectacle prescription. The height of the child was found to be positively correlated with the median of near viewing distance (r = 0.646, p = 0.001). Age, current ADD, age of cataract extraction surgery and bilaterality or monocularity of the aphakic eyes showed no significant correlation with the aforementioned viewing habits (all p > 0.05).
Conclusion:
By using the novel wearable device, we found the suitable ADD of spectacle prescription for aphakic infants is about +4.25 D. The height of the child was an influencing factor for ADD.
