presbyopia
Conditions
Interventions
Presbyopia Group:Using a mobile phone for 2 hours at a distance of 33cm while wearing single-vision, completely corrected glasses.
Control group:Using a mobile phone for 2 hours at a distance of 33cm while with single-vision, completely corrected glasses.
Presbyopia Group:Using a mobile phone for 2 hours at a distance of 33cm with +3.00D single vision reading glasses.
Control group:Using a mobile phone for 2 hours at a distance of 33cm with +3.00D single vision reading glasses.
Presbyopia Group:Using a mobile phone for 2 hours at a distance of 33cm with a hyperbolic mirror optical system.
Control group:Using a mobile phone for 2 hours at a distance of 33cm with a hyperbolic mirror optical system.
Sponsors
Eye Hospital, WMU
Eligibility
Sex/Gender
All
Age
18 Years to 55 Years
Inclusion criteria
Inclusion criteria: 1.The control group consists of adults aged 18-30 years, while the experimental group consists of adults aged 40-55 years; 2.The refractive power of both eyes is less than +1.00D and greater than -6.00D, with a refractive difference of less than 2.50D; 3.The best corrected visual acuity in both eyes is better than 0.1 logMAR; 4.The control group has near visual acuity of less than or equal to 0.1 logMAR at 33 cm, while the experimental group has a near addition requirement of greater than or equal to +0.50D at 33 cm..
Exclusion criteria
Exclusion criteria: 1. Accompanied by any organic eye diseases (such as cataracts, etc.); 2. History of previous eye surgery; 3. Poor overall health (such as heart disease, respiratory diseases) or cognitive impairment, neuropsychiatric disorders, etc., and those who cannot cooperate.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Accommodation convergence/accommodation;Accommodative Facility;Horizontal phoria;amplitude of accommodation;Subjective level of eye strain;near point of convergence;Vertical heterophoria;Fusional Vergence Facility;Blur point, breaking point, recovery point of near positive and negative fusional vergence; | — |
Countries
China
Contacts
Public ContactHuang Yingying
Eye Hospital, WMU
Outcome results
None listed