A New Measurement of Anseikonia Tolerance

Glostrup University Hospital, Copenhagen31 enrolled

Overview

Population 1: Measure the effect of size glasses from1-9% on stereopsis Population 2: Measure the effect of size glasses from 1-9% on stereopsis in two settings: * before and after cataract surgery * after dilation of the eye

Population 1: 21 eye healthy phakic individuals. Measurements: baseline stereopsis and stereopsis after size glass (1-9%) is added in front of the right eye and in front og the left eye. This measurement provides details on how much size difference a person can endure without impairing stereopsis. Population 2: 11 phakic eye healthy individuals awaiting cataract operation on both eyes. Measurements are the same as population 1 but this study group is also measured after dilating the eyes. This is to see if accommodation affects the measurement. A postoperative measurement six weeks after cataract operation is also performed to examine if cataract operation affects the measurement.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Aniseikonia Anisometropia and Aniseikonia

Interventions

Measurement of aniseikonia toleranceDIAGNOSTIC_TEST

Adding sizeglasses of different percent before right and left eye and measure the impact on stereopsis

Eligibility

Sex: ALLMin age: 60 YearsMax age: 95 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * No previous eye history * cataract grade \<= 1 * visual acuity above 0.8 Exclusion Criteria: * lack of cooperation * amblyopia * axial anisometropia * ametropia

Locations (1)

Rigshospitalet-glostrup

Glostrup Municipality, Danmark, Denmark

RECRUITING

Outcomes

Primary Outcomes

Aniseikonia tolerance

How many percent aniseikonia is tolerated before stereopsis is impaired. Measured by first measuring baseline stereopsis and here after adding aniseikonic (size glass) from 1-9% in front of the right and left eye to measure if stereopsis is impaired. If stereopsis is impaired at 4% sizeglas then aniseikonia tolerance is 4%.

Time frame: baseline

Change of Aniseikonia tolerance after surgery

Measurement of aniseikonia tolerance before and after surgery. Measurement: before and after surgery stereopsis is measured, hereafter aniseikonic glasses (size glass) from 1-9% is added in front of the right and left eye to see if stereopsis is impaired. If stereopsis is impaired with 3% aniseikonic glass then the tolerance is 3%. After surgery the measurement is repeated to examine if the aniseikonia tolerance is the same.

Time frame: six weeks after surgery

Data from ClinicalTrials.gov

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