Aberration, Corneal Wavefront, Refractive Errors
Conditions
Brief summary
Refractive surgeries can be divided into two distinct categories: 1) corneal surgeries (superficial and deep procedures) carried on the surface of the eye and 2) lens surgeries (phakic IOL, refractive lens exchange) - an intraocular intervention, performed in the anterior or posterior chamber or on the lens. In the proposed protocol focus is on the corneal refractive surgeries impact on monochromatic higher-order aberrations on the one hand and chromatic aberrations on the other. During the surgery in order to get the patient emmetropic, refractive surgery corrects optical defects by decreasing aberrations of lower orders ) simultaneously increases high-order aberrations (that is perceived by the patient as halo, glare or starburst). Informations about prevalence and causes of higher order aberrations after refractive surgery are numerous but there is no information about chromatic aberrations.
Interventions
None listed
Sponsors
Wroclaw Medical University
Wrocław University of Science and Technology
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* patient after corneal refractive surgery at least for 4 months * post surgical refraction within +/- 0.75 diopter of spherical and +/- 1.0 diopter of cylindrical error * willing and able to understand and sign an informed consent form.
Exclusion criteria
* patient unable to participate in the study * any corneal diseases, eyes trauma or systemic diseases history; keratoconus or tendency of keratoconus * corneal macula and obvious pannus; current enrolment in another clinical trial/research project
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Chromoretinoscopy for near (MEM) and distance | 6 months | Conducted with a modified by researchers retinoscopy with distinct filters |
| Aberrometry reading for corneal HOA | 6 months | Conducted with aberrometer and corneal tomography |
| Transverse chromatic aberration | 6 months | Conducted with a modified by researchers aniseikonia test (with red and green lenses) |
| number of high order and chromatic aberrations after refractive surgery | 6 months | number of high order and chromatic aberrations after refractive surgery |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change of contrast sensitivity for near vision | 6 months | without and after the introduction of glasses with accommodation support, a blue light filter or concave lenses up to -0,5 diopter |
| Visual Function Questionaire 25 | 6 months | Conducted with VFQ-25 test |
| Change in Hue 100 test | 6 months | without and after the introduction of glasses with accommodation support, a blue light filter or concave lenses up to -0,5 diopter |
Countries
Poland
Outcome results
None listed