The effect of brightness on near visual function in early presbyopia

JRCT ID: jRCT1030240325

Registered date:10/09/2024

Basic Information

• Recruitment status: Recruiting
• Health condition(s) or Problem(s) studied: Healthy individuals / Presbyopia
• Date of first enrollment: 10/09/2024
• Target sample size: 60
• Study type: Observational

Outcome(s)

• Primary Outcome: Amount of change in near visual acuity and near additional power associated with changes in brightness environment

Secondary Outcome

-Amplitude of accommodation
-Pupillary area
-Questionnaire on subjective eye symptoms
-Near functional visual acuity

Key inclusion & exclusion criteria

• Age minimum: >= 20age old
• Age maximum: <= 55age old
• Gender: Both

Include criteria

1) Age 20 years and above, up to 35 years; and 40 years and above, up to 55 years
2) Distance-corrected visual acuity of 1.0 or better in each eye, and distance-corrected near visual acuity of 0.5 or better with both eyes
3) Participants who can operate an iPhone and use applications without any issues.
4) Participants who are able to provide written consent after understanding the content of this study.

Exclude criteria

1) Systemic or ocular diseases affecting visual function
2) History of internal ocular or refractive surgery
3) Dry eye (corneal epithelial scoring of 3 or higher or presence of subjective symptoms)
4) Difficulty in accurate communication
5) Participants who are judged to be inappropriate as a cooperator by a doctor in charge.

Related Information

• Primary Sponsor: Negishi Kazuno
• Source(s) of Monetary Support: Research Grant from Kanagawa Ophthalmologists Association,Grant from the Foundation for Total Health Promotion,Department of Ophthalmology Keio University School of Medicine Fund of New Education Research