Optical Biometry and Spherical Aberration in Ametropic and Emmetropic Eyes
Aberrations play a significant role in the visual process and can be divided in lower-order and higher-order aberrations. The former can be measured using the commercially available IOL Master (Carl Zeiss Meditec AG, Germany) and have profound influence on visual acuity. Higher-order aberrations do not significantly influence visual acuity but affect the quality of vision and can cause halos, double vision, and night vision disturbances.
Background Cataract surgery has become a routine procedure in the developed countries. During this surgery, a foldable intraocular lens is usually inserted into the capsular bag. However, these lenses do not account for individual optical biometry data or aberrations. Therefore, it is important to provide data for ametropic and emmetropic eyes as this information might improve future intraocular lens design and lead to individually adapted lenses for yielding optimal visual acuity and quality results.
The aim of the present study is to clarify the correlation between refractive errors/axial eye length and spherical aberrations of the cornea.
Studieöversikt
Status
Studietyp
Inskrivning (Faktisk)
Kontakter och platser
Studieorter
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Vienna, Österrike, 1090
- Department of Clinical Pharmacology, Medical University of Vienna
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Deltagandekriterier
Urvalskriterier
Åldrar som är berättigade till studier
Tar emot friska volontärer
Kön som är behöriga för studier
Testmetod
Studera befolkning
Beskrivning
Inclusion Criteria:
- men and women aged between 40 and 60 years
- normal findings in the medical history unless the investigator considers an abnormality to be clinically irrelevant
- normal ophthalmic findings unless the investigator considers an abnormality to be clinically irrelevant
Exclusion Criteria:
- presence of any corneal or retinal disease
- Dry eye syndrome
- high astigmatism (>1 diopter)
- history of refractive surgery
- abuse of alcoholic beverages
- participation in a clinical trial in the 3 weeks preceding the study
- symptoms of a clinically relevant illness in the 3 weeks before the study day
- pregnancy
Studieplan
Hur är studien utformad?
Designdetaljer
Kohorter och interventioner
Grupp / Kohort |
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Cohort 1
40 subjects with high grarde myopia ranging from -10 diopters to -4.01 diopters
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Cohort 2
40 subjects with moderate myopia ranging from -4 diopters to -1.01 diopter
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Cohort 3
40 subjects with emmetropia, -1 diopter to +1 diopter
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Cohort 4
40 subjects with hyperopia, +1.01 diopter and more
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Vad mäter studien?
Primära resultatmått
Resultatmått |
Tidsram |
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Axial eye length
Tidsram: 1 day
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1 day
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Sekundära resultatmått
Resultatmått |
Tidsram |
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Refractive error
Tidsram: 1 day
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1 day
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Corneal radius
Tidsram: 1 day
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1 day
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Pupil diameter
Tidsram: 1 day
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1 day
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Anterior chamber depth
Tidsram: 1 day
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1 day
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Anterior corneal topography
Tidsram: 1 day
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1 day
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Corneal thickness map
Tidsram: 1 day
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1 day
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Samarbetspartners och utredare
Sponsor
Studieavstämningsdatum
Studera stora datum
Studiestart
Primärt slutförande (Faktisk)
Avslutad studie (Faktisk)
Studieregistreringsdatum
Först inskickad
Först inskickad som uppfyllde QC-kriterierna
Första postat (Uppskatta)
Uppdateringar av studier
Senaste uppdatering publicerad (Uppskatta)
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
Senast verifierad
Mer information
Termer relaterade till denna studie
Ytterligare relevanta MeSH-villkor
Andra studie-ID-nummer
- OPHTH-240512
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