Multifocal intraocular lenses (MIOLs) provide enhanced far and near visual acuity, but they can bring about halos and glare, which are caused by design deficiencies of the IOLs. Compared to monofocal intraocular lens, pseudo accommodation in nonphysiological state may increase the difficulty of neural compensation reconstruction in patients with multifocal intraocular lens implantation. Patients enrolled into the study will be followed for 1 year and will have study visits preoperatively, at 1 week, 3 months, 6 months, 12 months postoperatively.In this trial, we aimed to specify the time of neural compensation reconstruction in patients and to explore the changes of visual function in senile patients with monofocal or multifocal intraocular lens implantation.
Cataract extraction and intraocular lens (IOL) implantation are the current standard treatments for age-related cataract (ARC). Cataract surgery increases visual acuity but may lead to complaints after surgery. Multifocal intraocular lenses (MIOLs) provide enhanced far and near visual acuity, but they can bring about halos and glare, which are caused by design deficiencies of the IOLs. Fortunately, most of the halos and glare diminish with time. Niels et al noted that neural adaptation (NA) may explain the lower incidence of glare and halos in their study. Compared to monofocal intraocular lens, pseudo accommodation in nonphysiological state may increase the difficulty of neural compensation reconstruction in patients with multifocal intraocular lens implantation. In the present study, the investigators evaluated the activity of neurons in the visual cortex using fMRI both preoperatively and postoperatively. In addition, the investigators evaluated postoperative changes in VF, including visual acuity (VA), contrast sensitivity (CS), straylight values (SVs), and pattern visual evoked potential (PVEP), stereoscopic vision, wavefront aberrations at 1 week, 3 months, 6 months, 12 months postoperatively.In this trial, the investigators aimed to specify the time of neural compensation reconstruction in patients and to explore the changes of visual function in senile patients with monofocal or multifocal intraocular lens implantation.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
50
In this group, the surgery was performed with cataract extraction and multifocal intraocular lens (IOL) (Tecnis ZMB00). The standard technique in all patients consisted of sutureless phacomulsifacation using the Legacy 2000 Series and Infinity phacoemulsification machine (Alcon Laboratories Inc., Fort Worth, Texas, USA), with clear corneal incisions up to 3.2 mm and 5.0 to 5.5 mm capsulorhexis. Surgery in the fellow eye was performed 1 month later in each patient.
In the group, the surgery was performed with cataract extraction and monofocal intraocular lens (IOL) (Tecnis ZCB). The surgery technique was same as the multifocal intraocular lens group
All patients received subconjunctival dexamethasone (2 mg) during surgery
Zhognshan Ophthalmic Center, Sun Yat-sen University
Guangzhou, Guangdong, China
RECRUITINGChange from contrast sensitivity
Contrast sensitivity (CS) was tested with a Contrast Glare Tester 1000
Time frame: 1 week, 1 month, 3 month, 6 month,1 year after surgery
Change from functional magnetic resonance imaging
Time frame: 1 week, 1 month, 3 month, 6 month,1 year after surgery
Change from best corrected visual acuity
Time frame: 1 week, 1 month, 3 month, 6 month,1 year after surgery
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