Effect of improved intraocular lenses on contrast sensitivity tests

Effect of improved intraocular lenses on contrast sensitivity tests - Aspheric IOLs and contrast sensitivity

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

NL-OMON

Registry ID

NL-OMON29712

Enrollment

Registered

2006-10-25

Start date

2006-10-27

Completion date

Unknown

Last updated

2024-05-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

cataract spherical aberration

Interventions

Besides the spherical IOL, there also will be used an aspherical IOL.

Eligibility

Age

18 Years to 99 Years

Inclusion criteria

Inclusion criteria: - In both eyes cataract

Exclusion criteria

Exclusion criteria: - Cylindric correction larger than 1,5 D - Macula degeneration if the visual acuity from one or both eyes is less than 0,8 - Glaucoma - Diabetic retinopathy - Medication that influences the tear function, pupil size or accomodation of the eye - Pathology that influences the tear production - Presence of pathology between the two cataract operations - Younger than 18 years - Presence of senile dementia (MMSE

Design outcomes

Primary

Measure	Time frame
Main goal of this research is the comparison of the results of aspheric and spheric IOLs on contrast sensitivity and depth of focus.	—

Secondary

Measure	Time frame
The variable rMTF (relative modulation transfer) can be calculated from the results of a contrast sensitivity test. rMTF is an indicator of the aberrations of the eye and can be defined as the ratio between de contrast sensitivity in defocus situations and in optimal focus as function of the spatial frequencies. Because of this, both the contrast sensitivity tests are performed in four different defocus situations.	—

Measure

Time frame

The variable rMTF (relative modulation transfer) can be calculated from the results of a contrast sensitivity test. rMTF is an indicator of the aberrations of the eye and can be defined as the ratio between de contrast sensitivity in defocus situations and in optimal focus as function of the spatial frequencies. Because of this, both the contrast sensitivity tests are performed in four different defocus situations.

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Countries

Netherlands

Outcome results

None listed

Source: NL-OMON (via WHO ICTRP)