Myopic Astigmatism
Conditions
Brief summary
The recently introduced toric V4c toric ICL (STAAR Surgical Company, Monrovia, CA, USA) has been designed with a 360-µm central hole to allow aqueous humor to flow without the need for an iridotomy. As far as the investigators certain, there have been not well-established prospective studies on the role of the V4c toric ICL for myopic astigmatism correction. Therefore, the present study aimed to investigate the clinical outcomes and rotational stability and to analyze factors that influence the rotational stability in V4c toric ICL implanted eyes prospectively.
Interventions
PROCEDUREV4c toric ICL implantation surgery
The size and power of the V4c toric ICL were determined following the manufacturer's guidelines using a modified vertex formula. Emmetropia was the target refraction following surgery in all cases. Before surgery, three centration points were marked using the slit lamp while the patient, in sitting position, fixated on the center of the slit-lamp beam, which was narrowed as much as possible.
Sponsors
Yonsei University
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
19 Years to 45 Years
Healthy volunteers
No
Inclusion criteria
* Age 19-45 years * Presence of myopia with a manifest refraction spherical equivalent between -5.00 and -20.00 diopters (D) * Astigmatism between -0.75 and -5.00 D
Exclusion criteria
* Previous ocular or intraocular surgery (other than ICL implant) * Anterior chamber depth from the endothelium \< 2.8 mm * Corneal endothelial cell density \< 2000 cells/mm2 * Evidence of acute or chronic corneal infection, corneal inflammation * Glaucoma, amblyopia, retinal detachment, diabetic retinopathy, macular degeneration, or neuro-ophthalmic disease
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Visual outcome | 6 months after the surgery | Evaluation of logarithm of the minimum angle of resolution (logMAR) uncorrected distance visual acuity (UDVA) and CDVA, manifest refraction, autorefractor-keratometer (ARK-530A; Nidek Co., Ltd.). The change of astigmatism was analyzed by the Alpins method. |
| Refractive outcome | 6 months after the surgery | Evaluation of logarithm of the minimum angle of resolution (logMAR) uncorrected distance visual acuity (UDVA) and CDVA, manifest refraction, autorefractor-keratometer (ARK-530A; Nidek Co., Ltd.). The change of astigmatism was analyzed by the Alpins method. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Rotational stability | immediately after the surgery | Rotational stability of the toric ICL was measured using the OPD-Scan III (NIDEK Co. Ltd., Gamagori, Japan). The rotation was defined as the difference between the intended axis and the achieved axis at each follow-up. Assuming that the adjusted axis was identical to the intended angle, postoperative rotation was automatically measured by determining the angle between the adjusted axis and alignment axis. Each measurement was performed three times by one physician, and the average of the three measurements was used in the analysis. |
Countries
South Korea
Outcome results
None listed