ChiCTR‐IOR‐17010432.

Study name	Myopia progression with invisible round segment bifocal spectacle lenses
Methods	Randomised parallel‐group design
Participants	Inclusion criteria: BCVA of 6/9.5 or better with spectacles in each eye; normal ocular health; ability to comply with trial protocol; parental ability to understand English and Mandarin and parental consent Exclusion criteria: history of allergy to topical anaesthetics; strabismus; eye surgery; ocular or systemic condition affecting vision; ocular injury; use of BFs, spectacles, OK, vision training, orthoptic training, or conditions that affect ability to wear spectacles
Interventions	Intervention: BF spectacles Comparison intervention: SVLs
Outcomes	Primary outcome: SER Secondary outcome: AL Maximum follow‐up: not reported
Starting date	February 2017 Estimated end date: September 2018
Contact information	chictr.org.cn/showproj.aspx?proj=17727
Notes