Evaluation of contrast sensitivity testing methods in a presbyopic phakic population Eye Diseases Presbyopia
Conditions
Sponsors
Ocular Technology Group - International
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. Aged 40-50 years 2. Spectacle refraction: Distance: Sphere: -6.00D to +4.00D, Astigmatism: 0.00D to -3.00D, Near Addition: +0.50D to +2.50D 3. Best corrected visual acuity of at least 20/20 in each eye 4. Spectacles or soft contact lenses habitual visual correction 5. Have normal eyes with the exception of a need for visual correction 6. Have read and understood the Participant Information Sheet in English 7. Have read, signed and dated the Informed Consent 8. Be willing and able to adhere to the instructions set in the clinical protocol and maintain the appointment schedule
Exclusion criteria
Exclusion criteria: 1. Ocular anterior segment infection, inflammation, abnormality or active disease that would contraindicate contact lens wear 2. Newly prescribed (within past 30 days) use of some systemic medications (such as antihistamines, decongestants, diuretics, muscle relaxants, tranquilisers, stimulants, anti-depressants, anti-psychotics, oral contraceptives) or new prescription eye drops which is not rewetting eyedrops for which contact lens wear would be contraindicated as determined by the investigator 3. Monocular patients (only one eye with functional vision) or participants fit with only one lens 4. Any moderate or severe ocular condition observed during the slit-lamp examination at the enrollment visit 5. History of herpetic keratitis, ocular surgery or irregular cornea 6. Known pregnancy during the study period 7. Enrollment of the investigator or his/her staff, family members of the investigator, family members of the investigator's staff, or individuals living in the households of these individuals
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Contrast sensitivity measured at photopic (85 cd/m²) and mesopic (2.5 cd/m²) light levels at up to five spatial frequencies: 18, 12, 6, 3 and 1.5 c/degree using: 1. OTG-i Vision Suite letter contrast sensitivity test 2. M&S Technologies linear sine wave grating test from the Clinical Trial Suite 3. Vector Vision standardized contrast sensitivity Measured twice up to 1 week apart | — |
Secondary
| Measure | Time frame |
|---|---|
| There are no secondary outcome measures | — |
Countries
United Kingdom
Contacts
Public ContactDeborah Moore
Outcome results
None listed