Cataract Clinical Trial
Official title:
Comparison of In-the-bag Stability Between Single-piece and Three-piece Intraocular Lens Via Scheimpflug Imaging System
Verified date | November 2015 |
Source | Sun Yat-sen University |
Contact | n/a |
Is FDA regulated | No |
Health authority | China: Ministry of Health |
Study type | Interventional |
Rapid advances of cataract surgery techniques and intraocular lens (IOL) technology have
enabled the transition of cataract surgery from blindness relief to refractive correction.
An ideal IOL is the critical component to achieve the refractive target of cataract surgery.
Biocompatibility, rate of posterior capsule opacification (PCO) and visual quality have all
been suggested as the critical factors of an ideal IOL and widely investigated. Recently,
stability of IOL position has also been suggested as one of those critical factors due to
its close correlation with postoperative visual function. Data suggests that IOL forward
movement of 0.29 mm along the visual axis is associated with -0.4D myopic shift. Wang and
colleagues recently reported that 0.5mm decentration of an aspheric IOL could eliminate its
aberration-correcting effect. Poor stability could even lead to IOL exchange, an additional
surgery that put both surgeons and patients in pain.
As the supporting element of an IOL, the haptics are crucial to keep the IOL in place.
Various haptic designs are being compared in terms of position stability of IOLs. Haptic
designs of single-piece versus 3-piece are often compared because they are currently the
most commonly used types. Single-piece IOLs have soft and broader haptics which are made of
the same material as the optic, usually hydrophobic or hydrophilic acrylic, whereas 3-piece
IOLs have rigid haptics which are made of poly methyl methacrylate (PMMA). Clinical studies
comparing these haptic designs have yielded controversial results regarding their position
stability in the capsular bag, which is the most recommended site for IOL fixation in an
uneventful cataract surgery.
Status | Completed |
Enrollment | 65 |
Est. completion date | December 2012 |
Est. primary completion date | December 2012 |
Accepts healthy volunteers | No |
Gender | Both |
Age group | 60 Years to 85 Years |
Eligibility |
Inclusion Criteria: - diagnosis of bilateral age-related cataract and age between 60 to 85 years Exclusion Criteria: - vision-impairing diseases other than cataract, severe refractive error (Preoperative spherical equivalent of either eye >-6.00D or +5.00D) - history of ocular trauma, past refractive surgery or other ophthalmic surgery, capsular or zonular disorders that might affect the post-operative centration of IOLs - surgical complications including severe hyphema, iris injury, repeated IOL implantation - unable to achieve in-the-bag implantation of IOL, corneal sutures during surgery |
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Treatment
Country | Name | City | State |
---|---|---|---|
China | Zhognshan Ophthalmic Center, Sun Yat-sen University | Guangzhou | Guangdong |
Lead Sponsor | Collaborator |
---|---|
Sun Yat-sen University |
China,
de Castro A, Rosales P, Marcos S. Tilt and decentration of intraocular lenses in vivo from Purkinje and Scheimpflug imaging. Validation study. J Cataract Refract Surg. 2007 Mar;33(3):418-29. — View Citation
Korynta J, Bok J, Cendelin J. Changes in refraction induced by change in intraocular lens position. J Refract Corneal Surg. 1994 Sep-Oct;10(5):556-64. — View Citation
Rosales P, Marcos S. Phakometry and lens tilt and decentration using a custom-developed Purkinje imaging apparatus: validation and measurements. J Opt Soc Am A Opt Image Sci Vis. 2006 Mar;23(3):509-20. — View Citation
Wang L, Koch DD. Effect of decentration of wavefront-corrected intraocular lenses on the higher-order aberrations of the eye. Arch Ophthalmol. 2005 Sep;123(9):1226-30. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | The grade of in-the-bag stability between single-piece intraocular lenses (IOLs) and three-piece intraocular lenses(IOLs) | 3 months after the surgery | No | |
Secondary | The visual acuity between single-piece intraocular lenses (IOLs) and three-piece intraocular lenses(IOLs) | 3 months after the surgery | No |
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