Measurements in 48 healthy subjects aged 20 to 35 years (24 subjects) and 55 to 70 years (24 subjects).
Conditions
Interventions
Best corrected visual acuity was determined with an ETDRS chart and the spherical aberration (SA) was measured with a wavefront analyzer (WASCA version 1.26.3, Asclepion Meditec, Jena, Germany).
The
Von Bekesy tracking method)
2. The Holladay sine-wave (1.5 -18 cpd) modulated circular lines (HACSS) (M&S Technologies, Skokie, Illinois, USA), and with six contrast sensitivity chart tests:
1. Pelli Robson contrast sensitivit
2. low contrast ETDRS-like optotype chart 2.5%
3. Low contrast ETDRS-like optotype chart 10%
4. Edge contrast sensitivity test: GECKO
5. Edge contrast sensitivity test: GECKO-100
6. Vector Vision. Contrast sensitivity is measured in mesopic (3 cd/m2) and photopic (160 cd/m2) conditions, using only the dominant eye.
Tests were performed at optimal refractive state of the eye
Sponsors
University Hospital Groningen, department ophtalmology
Hanzeplein 1
Postbus 30.001
9700 RB Groningen
The Netherlands
Tel: (+31)050-3612510
Fax: (+31)050-3611709
AMO (advanced medical optics) Groningen B.V.
Van Swietenlaan 5
9728 NX Groningen
Tel: (+31)050-5296600
Fax: (+31)050-5267860
Eligibility
Inclusion criteria
Inclusion criteria: No ocular pathology.
Exclusion criteria
Exclusion criteria: 1. Refractive correction larger than +/- 2 D; 2. Cylindrical correction larger than 1.5 D; 3. Cylindrical axis more then 20º from the horizontal or vertical axis.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Selection of the contrast sensitivity test which predicts the spherical aberration most reliably. | — |
Secondary
| Measure | Time frame |
|---|---|
| 1. Spherical aberration as function of age; 2. RMS as function of age; 3. Contrast sensitivity as function of age; 4. Influence of defocus on contrast sensitivity. | — |
Contacts
Public ContactK.W. Gaalen, van
University Medical Center Groningen (UMCG), Department Ophtalmology, P.O. box 30.001
Outcome results
None listed