An observational study in Refractive Errors and Cataract, sponsored by Zhongshan Ophthalmic Center, Sun Yat-sen University. Not yet recruiting. Open to participants aged 0 Years to 100 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-12-02.
Sponsored by Zhongshan Ophthalmic Center, Sun Yat-sen University · Observational
To establish the baseline levels and monitor the progress of two newly introduced global eye health indicators in Xinxing County, including effective refractive error coverage (eREC) and effective cataract surgery coverage (eCSC). And to assess the prevalence and treatment status of common eye disease in Xinxing County.
420 studies on the registry are indexed under Refractive Errors; 59 are open to participants now.
This study's planned enrollment of 3,000 is above the median of 150 across 108 observational studies indexed under Refractive Errors.
Browse Refractive Errors studies →Zhongshan Ophthalmic Center, Sun Yat-sen University is the lead sponsor of 164 studies on the registry; 80 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Primary and secondary school students in Xinxing County and people covered by the national basic public health service, including children aged 0-6, seniors over 65 years old and diabetic patients, etc.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Visual acuity
Test and record uncorrected visual acuity; if the participant wears glasses, measure the best corrected visual acuity with glasses. For participants with poor unaided or corrected visual acuity (\<4.7), perform additional pinhole visual acuity testing.
Time frame: through study completion, an average of 1 year
Strabismus
Assess strabismus status and angle at both near and distance fixation.
Time frame: through study completion, an average of 1 year
Autorefraction
Measure spherical power, cylindrical power, and axis in both eyes. Cycloplegia may be required in children, preferably using 1% tropicamide, one drop each time, three times. Before cycloplegia, check allergy history, medical history, and anterior chamber depth; inform guardians of potential risks and precautions related to cycloplegia, and ensure that guardians accompany the child throughout the procedure.
Time frame: through study completion, an average of 1 year
Questionnaire
Questionnaires on demographics, disease histories and etc.
Time frame: through study completion, an average of 1 year
Fundus examination
Examine the retina of both eyes and document any retinal pathology. If pupils are too small, mydriasis may be required, following the same drugs and procedures as above.
Time frame: through study completion, an average of 1 year
Anterior segment examination
Use a slit lamp to examine eyelids, conjunctiva, cornea, anterior chamber, and lens in both eyes. Record any abnormalities. Grade lens opacities according to the LOCS III classification system.
Time frame: through study completion, an average of 1 year
No study locations are listed for this record.
Plan to share: No
No publications or documents are linked to this record.
This study is not yet recruiting, as verified in Sep 2025. You cannot join it, but the record below documents what was studied.
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Zhongshan Ophthalmic Center, Sun Yat-sen University →