Compare postoperative Subjective and objective visual quality and economic efficiency of different Intraocular Lens(IOLs) implantation designed for the correction of presbyopia.
Compare postoperative Subjective and objective visual quality and economic efficiency of different Intraocular Lens Implantation designed for the correction of presbyopia.The subjects will undergo bilateral uneventful phacoemulsification and implantation of IOL.The subjects will be divided into several groups according to the type of the IOLs，including monofocal IOL group,monovision designed group ，bifocal IOL group, mix bifocal IOL group，trifocal IOL group，Exteded Depth of Focus(EDOF) IOL group and blend vision group. Compare the Subjective and objective visual quality and economic efficiency among these groups at 3 months postoperatively.
Study Type
OBSERVATIONAL
Enrollment
140
The patients will undergo bilateral phacoemulsification and bifocal IOLs implantation.
The patients will undergo phacoemulsification and mix different bifocal IOLs implantation bilaterally.
The patients will undergo bilateral phacoemulsification and trifocal IOLs implantation.
Peking University Third Hospital
Beijing, Beijing Municipality, China
RECRUITINGmonocular and binocular visual acuity
uncorrected distance visual acuity (UCVA), intermediate visual acuity, near visual acuity will be measured at 5m, 80cm and 40cm respectively. All visual acuity measurements will be conducted under photopic conditions (85 cd/m2) and at 100% contrast
Time frame: 3 months postoperatively
economic efficiency
economic efficiency was defined as the ratio of objective spectacle independence (UCVA better than 0.10 logMAR) and IOL price, then compare the economic efficiency among different groups.
Time frame: 3 months postoperatively
Binocular Contrast sensitivity
Contrast sensitivity measures will be conducted binocularly, under photopic, mesopic (5 cd/m2), photopic with glare and mesopic with glare conditions, with the OPTEC 6500 contrast sensitivity test (Stereo Optical, USA). Contrast sensitivity will be evaluated at five spatial frequencies (1.5, 3, 6, 12, and 18 cycles per degree \[cpd\]). Patients will be allowed 5 minutes to adapt to each illumination level before testing.
Time frame: 3 months postoperatively
Binocular Defocus Curve
Binocular defocus curves will be obtained in all patients, positioned at 5m under photopic (\>85 cd/m 2 ) condition to measure the visual acuity with each defocus lens, representing the consecutive visual function of each eye. Negative lenses were added in 0.50 D steps and the visual acuity will be recorded for each type of defocus level. The procedure will be then repeated but with positive lenses. The range of defocus evaluated is from -4.00D to +2.00D.
Time frame: 3 months postoperatively
stereopsis
distant stereopsis will be measured by block diagram of random-spot synoptophore, while near stereopsis will be measured by Yan's stereogram.
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The patients will undergo bilateral phacoemulsification and EDOF IOLs implantation.
The patients will undergo phacoemulsification and different IOLs implantation bilaterally.
The patients will undergo bilateral phacoemulsification and monofocal IOLs implantation with monovision designed.
The patients will undergo bilateral phacoemulsification and monofocal IOLs implantation with emmetropia designed.
Time frame: 3 months postoperatively
Fusion function
The fusion function of perception and movement (convergence and divergence)will be examined with a synoptophore.
Time frame: 3 months postoperatively
Subjective visual quality
Using NEI-VFQ-25 questionnaire (Chinese version). Photic phenomena, spectacle independence, and satisfaction questionnaire.
Time frame: 3 months postoperatively