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NCT Number: NCT00712231

Limitations of Using a Sheimpflug Image-Based Device for Measuring Anterior Chamber Depth in Pseudophakic Eyes

There have been numerous studies comparing various ACD measurements in phakic eyes,while researches comparing ACD in pseudophakic eyes are less extensive. With the recent popularity of presbyopia correction, measuring the ACD will facilitate differentiating pseudophakic accommodation from pseudoaccommodation. It is thus mandatory to verify the accuracy of ACD measurement of these devices since the innovation of various IOLs in the recent decade makes this task more complicated. In this study, we will assess the limitations of using Pentacam for ACD measurement in pseudophakic eyes and compare Pentacam measurement with IOLMaster and A-scan measurements.

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Key information

Conditions

Cataract Eye Diseases Lens Diseases

Age range

40 year–80 year

Sex eligibility

All sexes

Study type

Observational

About this study

In this prospective study, ACD was measured in 90 phakic and 94 pseudophakic eyes by Pentacam, IOLMaster and A-scan. Correlations and differences between the three measurements were investigated. The accuracy in detecting the anterior lens surface in pseudophakic eyes was also assessed.Differences in ACD-Pen, ACD-IOLM, and ACD-A were analyzed using one-way analysis of variance (ANOVA). When an overall significance of P< 0.05 was obtained, pair-wise comparisons were made using Tukey's multiple comparison t tests. The association between ACD-Pen, ACD-IOLM, and ACD-A was assessed using Pearson's correlation test. The distribution of erroneous ACD-Pen measurement for the three IOLs was analyzed with the chi-square test. In all analyses, P <0.05 was considered statistically significant.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Phakic group: randomized
  • Pseudophakic eyes : the cases accepted cataract surgery

Exclusion criteria

  • Previous ocular trauma or intraocular surgery other than cataract surgery;
  • Contact lens use in the past two months;
  • Use of medication that might affect the pupil; corneal disease or ocular infection;
  • History of ocular disease, such as
  • Dry eye syndrome
  • Uveitis
  • Glaucoma
  • Ocular tumor
  • Cases with any surgical complications were also excluded.

Sponsors and collaborators

Lead sponsor

Far Eastern Memorial Hospital

Other

Registry information

Official study title

To Assess the Degree of Agreement of Anterior Chamber Depth Measurements by 2 Optical Devices (Pentacam and IOLMaster) and Compare Them With Contact Ultrasound A-Scan in Phakic and Pseudophakic Eyes.

Important dates

Study start
2008
Primary completion
2008
Study completion
2008
First posted
Jul 9, 2008
Registry last updated
Jul 9, 2008

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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