Evaluating photoscreeners II: MTI and fortune videorefractor

Area of Science:

• Ophthalmology
• Pediatric Eye Care
• Medical Device Evaluation

Background:

• Amblyopia is a significant public health issue, treatable with early detection.
• Photoscreeners are tools used to identify amblyopia risk factors like refractive errors and strabismus in children.
• Early detection of amblyopia is crucial for effective treatment outcomes.

Purpose of the Study:

• To evaluate the performance of two commercial photoscreeners: the MTI photoscreener and the Fortune Optical VRB-100 videophotorefractor.
• To assess the sensitivity and specificity of these devices in detecting amblyopiogenic risk factors in a high-prevalence pediatric population.
• To inform the decision for a larger-scale trial in the general population.

Main Methods:

• A double-masked study involving 105 children aged 12-44 months with known or normal vision.
• Photoscreening was conducted without cycloplegia using both the Fortune and MTI devices.
• Ophthalmic examinations were performed to identify risk factors, with photoscreen images independently reviewed by masked observers.

Main Results:

• The Fortune photoscreener showed sensitivities ranging from 60% to 68% and specificities from 75% to 86%.
• The MTI photoscreener demonstrated sensitivities from 56% to 61% and specificities from 79% to 86%.
• No significant differences in performance were observed between the two readers for either instrument.

Conclusions:

• Both evaluated photoscreeners performed unsatisfactorily in detecting amblyopia risk factors in children aged 1-4 years.
• The study does not recommend either device for screening this age group due to inadequate sensitivity and specificity.
• High sensitivity and specificity are essential for effective screening in populations with low amblyopia prevalence to prevent misreferrals.