visual fatigue
Conditions
Interventions
Test group A:Wear single-vision lenses, then wear progressive lenses.
Test group B:Wear progressive lenses, then wear single-vision lenses.
Sponsors
Tianjin Eye Hospital
Eligibility
Sex/Gender
All
Age
20 Years to 45 Years
Inclusion criteria
Inclusion criteria: 1. written informed consent has been obtained and signed by the subject; 2. be an adult between the ages of 20 and 45 years (including the threshold); 3. have a best-corrected distance visual acuity of >=1.0 in both eyes; 4.? no ocular diseases or psychiatric disorders, no history of surgery for neurological diseases, and no manifest strabismus or amblyopia.
Exclusion criteria
Exclusion criteria: 1. subjects who may suffer from ocular diseases that affect vision or refractive error (e.g. cataracts and other lens-damaging diseases, glaucoma, macular degeneration, keratoconus, uveitis, retinal detachment, severe vitreous clouding, etc.); 2. any systemic or systemic disease that contraindicates the use of progressive lenses, as well as those who are undergoing medication for diseases that would affect vision and the use of progressive focal lenses 3. those who are not suitable for long time medium and close distance workers and those who are used to looking upwards. 4. those who have vertical aberration between the two eyes and are not suitable for wearing progressive lenses; 4. those who have a vertical parallax of 2.00D or more between the two eyes; 5. Participate in other clinical tests at the same time; 6. those who are unable to use the lenses as required and other conditions deemed unsuitable by the researcher.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Questionnaire on Visual Fatigue Symptoms;Flash Fusion Frequency(CFF); | — |
Secondary
| Measure | Time frame |
|---|---|
| Heterophoria;Accommodative response;Melting range;Amplitude of Accommodation; | — |
Countries
China
Contacts
Public ContactJiang Yanglin
Tianjin Eye Hospital
Outcome results
None listed