Monitoring of Visual Axis Opacification Under Non-clinical Settings

Cataract Clinical Trial

Official title:

Self-monitoring of Visual Axis Opacification (VAO) Under Non-clinical Settings in China

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT02626416
• Other study ID #: CCPMOH2010-China10
• Status: Not yet recruiting
• Phase: N/A
• First received: December 7, 2015
• Last updated: December 7, 2015
• Start date: January 2016
• Est. completion date: January 2018

Study information

• Verified date: December 2015
• Source: Sun Yat-sen University
• Contact: n/a
• Is FDA regulated: No
• Health authority: China: Ministry of Health
• Study type: Interventional

Clinical Trial Summary

The incidence rate of postoperative capsular opacification (PCO) in children after cataract surgery is reported to be as high as 100%, while timely Nd: YAG laser posterior capsulotomy is effective to treat visual axis opacification (VAO) caused by PCO. Therefore, long-term follow-up, timely diagnosis and treatment is important to improve patient's outcome.

The major and central part of lens is easy to be observed through a dilated pupil. Especially, opacification in the lens and/or lens capsule is distinctive showing as "white" on the "black" background. The characteristic features of the disease and advances in photographic technique with mobile phone make it possible for patients and/or their guardians to monitor the progress of cataract or PCO with mobile application in a "self-help" manner under non-clinical settings.

Description:

The incidence rate of postoperative capsular opacification (PCO) in children after cataract surgery is reported to be as high as 100%, while timely Nd: YAG laser posterior capsulotomy is effective to treat visual axis opacification (VAO) caused by PCO. Therefore, long-term follow-up, timely diagnosis and treatment is important to improve patient's outcome.

The major and central part of lens is easy to be observed through a dilated pupil. Especially, opacification in the lens and/or lens capsule is distinctive showing as "white" on the "black" background. The characteristic features of the disease and advances in photographic technique with mobile phone make it possible for patients and/or their guardians to monitor the progress of cataract or PCO with mobile application in a "self-help" manner under non-clinical settings. In this way, patients and/or guardians could adjust the time of return to clinical follow-up visit accordingly. Furthermore, standardized and analyzed pictures could be sent to clinicians for remote diagnosis when necessary.

The investigators developed a mobile phone application LenZOC. The investigators aimed to assess whether mobile phone application for parents of children with cataracts would improve their adherence with follow-up and increase rates of timely detection and management of treatable conditions such as posterior capsular opacification (PCO).

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 1400
• Est. completion date: January 2018
• Est. primary completion date: January 2018
• Accepts healthy volunteers: No
• Gender: Both
• Age group: N/A to 18 Years

Eligibility

Inclusion Criteria:

• Children after cataract surgery for more than 1 year without any postoperative complications

• Without other ocular abnormality

• Parents owned a smart mobile phone that meets the requirements for installation of the LenZOC

• Written informed consents provided

Exclusion Criteria:

• Intraocular pressure >21 mmHg

• Pre-existing ocular diseases including but not restricted to:

Glucoma Micro-cornea Micro-ophthalmic Diseases of post-segment that might lead to VAO

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Cataract

Intervention

Device:
• LenZOC (mobile application)
The transparency of the visual axial at the anterior segment is observed through a dilated pupil. Image of the eye of a patient taken with LenZOC is calibrated with a standardized white and black bar adhered to the patient's eyelid. Calibrated images are dimmed as graysalegrayscale. The intensity and progress of visual axial opacification (VAO) is quantified as absolute area and relative area (calculated as: absolute area of VAO/ absolute area of dilated pupil).

Locations

Country	Name	City	State
China	Zhognshan Ophthalmic Center, Sun Yat-sen University	Guangzhou	Guangdong

Sponsors (1)

Lead Sponsor	Collaborator
Sun Yat-sen University

Country where clinical trial is conducted

China, 

References & Publications (5)

Lin H, Chen W, Luo L, Congdon N, Zhang X, Zhong X, Liu Z, Chen W, Wu C, Zheng D, Deng D, Ye S, Lin Z, Zou X, Liu Y. Effectiveness of a short message reminder in increasing compliance with pediatric cataract treatment: a randomized trial. Ophthalmology. 2012 Dec;119(12):2463-70. doi: 10.1016/j.ophtha.2012.06.046. Epub 2012 Aug 24. — View Citation

Lin H, Long E, Chen W, Liu Y. Documenting rare disease data in China. Science. 2015 Sep 4;349(6252):1064. doi: 10.1126/science.349.6252.1064-b. — View Citation

Plager DA, Lynn MJ, Buckley EG, Wilson ME, Lambert SR; Infant Aphakia Treatment Study Group. Complications, adverse events, and additional intraocular surgery 1 year after cataract surgery in the infant Aphakia Treatment Study. Ophthalmology. 2011 Dec;118(12):2330-4. doi: 10.1016/j.ophtha.2011.06.017. Epub 2011 Sep 16. — View Citation

Rivas-Perea P, Baker E, Hamerly G, Shaw BF. Detection of leukocoria using a soft fusion of expert classifiers under non-clinical settings. BMC Ophthalmol. 2014 Sep 9;14:110. doi: 10.1186/1471-2415-14-110. — View Citation

Rong X, Ji Y, Fang Y, Jiang Y, Lu Y. Long-Term Visual Outcomes of Secondary Intraocular Lens Implantation in Children with Congenital Cataracts. PLoS One. 2015 Jul 31;10(7):e0134864. doi: 10.1371/journal.pone.0134864. eCollection 2015. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Times of follow-ups for each participant		up to one year	No
Secondary	Best corrected visual acuity		up to 24 weeks	No

External Links

•   Home Page of Zhongshan Ophthalmic center