ABSTRACT
To analyze the post operative results of targeting zero spherical aberration by selecting the best-fit aspheric intraocular lens [IOL], based on preoperative corneal spherical aberration of patients with phacoemulsification surgery. AlHokama Eye Specialist Center, Riyadh, Saudi Arabia. -Period: From the 1st of October 2012 until the 10th of April 2013. Fifty-three eyes, were subjected to phacoemulsification cataract surgery and divided into two groups, 34 eyes were implanted with aspheric lOLs based on their corneal spherical aberration targeting post operative zero total spherical aberration, whereas 19 eyes were implanted with neutral aspheric lOLs regardless of their corneal spherical aberrations [CSAs]. As a pre and post routine examination, patients underwent: slit lamp testing, intraocular pressure [IOP] measuring, fundus examination, best spectacle corrected visual acuity [BSCVA] manifest refraction, pupillometry, axial length, contrast sensitivity, and corneal aberration measurement using Pentacam HR [OCULUS, Germany] at the 6-mm optical zone. Post operatively, visual function questionnaire [VF-14] was asked to all patients. Fifty-three eyes of 45 patients, whose age ranged from 45 to 90 years old, were available for analysis, the selected group was implanted with Tecnis ZA9003 or ZCBOO [Abbott Medical Optics] lOLs in 17 eyes with corneal spherical aberration of more than 0.27 microm, AcrySof IQ SN60WF [Alcon Laboratories Inc.] lOLs were implanted in 4 eyes with CSA = [0.2-0.27] microm, and Rayner 970C, 920H or 620H lOLs with spherical aberration [SA] = 0 in 13 eyes with CSA less than 0.20 microm. The other group of 19 eyes was implanted with aspheric lOLs that have zero spherical aberration [Rayner 970C or 920H] regardless of their CSA. Root mean squars [RMS] of total corneal aberration positively correlates to the pupil diameter [P = 0.0031, r = 0.3989]. A low negative correlation was found between the corneal spherical aberration of the fourth ordered [Z40] and the axial length [r = -0.2009, P = 0.1492]. There was no significant difference between the selected and non-selected group in contrast sensitivity, best spectacle corrected visual acuity, and visual satisfaction [P= 0.5316, P = 0.3919, P = 0.7667]. Customized selection of aspheric lOLs based on the eyes' corneal spherical aberration has no significant importance comparing their results with the non-selected group
ABSTRACT
To find out the mean corneal spherical aberration and its changes with age in Saudi population. AlHokama Eye Specialist Center, Riyadh, Saudi Arabia. Three hundred [300] eyes of 185 Saudi subjects [97 men and 88 women], whose age ranged from 15 to 85 years old, with matched refractive errors, were divided into three groups according to their age, 100 for each. All the subjects were included in measuring the spherical aberration [SA] using pentacam HR [OCULUS, Germany] at the 6-mm optical zone. The mean corneal spherical aberration [CSA] of the fourth order [4] of the whole groups was 0.252 +/- 0.1154 jam. Patients from 15 to 35 years old have root mean square [RMS] of CSA of 0.2068 +/- 0.07151 microm, 0.2370 +/- 0.08023 urn was the RMS of CSA of the patients from 35 to 50 years old, while those from 50 to 85 years old have a CSA-RMS of 0.31511 +/- 0.1503 microm [P < 0.0001]. A positive correlation was found between the spherical aberration [4] and the progress of age [r = 0.3429, P < 0.0001]. The high order aberration [HOA] presented 28.1% of the total corneal aberrations. While the fourth order corneal spherical aberration constituted 57% of the HOA and 16% of the total aberration. The pupil diameter shows a negative correlation with the increase in age [P = 0.0012]. Our results showed a CSA [4] that is varied among the population, comparable to other studies, and significantly correlates to the progress of age