scholarly journals Inter-ocular and inter-visit differences in ocular biometry and refractive outcomes after cataract surgery

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyun Sup Choi ◽  
Hyo Soon Yoo ◽  
Yerim An ◽  
Sam Young Yoon ◽  
Sung Pyo Park ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Axial Length ◽  
The Other ◽  
Corneal Power ◽  
Refractive Outcomes ◽  
Ocular Biometry ◽  
Intraocular Lens Power ◽  
Lens Power ◽  
Group D

Abstract This study aimed to determine whether inter-ocular differences in axial length (AL), corneal power (K), and adjusted emmetropic intraocular lens power (EIOLP) and inter-visit differences in these ocular biometric values, measured on different days, are related to refractive outcomes after cataract surgery. We retrospectively reviewed 279 patients who underwent phacoemulsification. Patients underwent ocular biometry twice (1–4 weeks before and on the day of surgery). Patients were divided into three groups: group S (similar inter-ocular biometry in different measurements; n = 201), group P (inter-ocular differences persisted in the second measurement; n = 37), and group D (inter-ocular difference diminished in the second measurement; n = 41). Postoperative refractive outcomes (mean absolute errors [MAEs]) were compared among the groups. Postoperative MAE2, based on second measurement with reduced inter-ocular biometry difference, was smaller than that calculated using the first measurement (MAE1) with borderline significance in group D (MAE1, 0.49 ± 0.45 diopters vs. MAE2, 0.41 ± 0.33 diopters, p = 0.062). Postoperative MAE2 was greater in group P compared to the other two groups (p = 0.034). Large inter-ocular biometry differences were associated with poor refractive outcomes after cataract surgery. These results indicate that measurements with smaller inter-ocular differences were associated with better refractive outcomes in cases with inter-visit biometry differences.

scholarly journals Comparison of four formulas for the intraocular lens power prediction

2019 ◽  
Author(s):  
Yanjun Hua ◽  
Wei Qiu ◽  
Qiang Wu
Keyword(s):  
Prospective Study ◽  
Intraocular Lens ◽  
Axial Length ◽  
Power Prediction ◽  
Ocular Biometry ◽  
Intraocular Lens Power ◽  
Iol Power ◽  
Lens Power ◽  
Better Than

Abstract Purpose To assess the accuracy of four formulas for intraocular lens (IOL) power prediction in cataractous eyes. METHODS In this prospective study, 51 eyes of 38 cataractous patients with an axial length (AL) between 24.0 and 26.0 mm were included. Preoperatively, Topolyzer, IOLMaster and A-scan were performed. At least 3 months after the surgery, subjective refraction was conducted. Haigis, SRK/T, Hoffer Q and Holladay 1 formulas based on ocular biometry from A-scan combining Topolyzer, IOLMaster combining Topolyzer and IOLMaster only were applied for IOL power prediction. RESULTS The four formulas based on biometry from IOLMaster combining Topolyzer and IOLMaster only performed better than those based on biometry from A-scan combining Topolyzer. Based on biometry from IOLMaster combining Topolyzer, Haigis formula had a mean NEs of -0.03 ± 0.71 D and a mean AEs of 0.53 ± 0.47 D, SRK/T formula had a mean NEs of 0.37 ± 0.72 D and a mean AEs of 0.63 ± 0.50 D, Hoffer Q formula had a mean NEs of 0.05 ± 0.62 D and a mean AEs of 0.43 ± 0.44 D, Holladay 1 formula had a mean NEs of 0.32 ± 0.63 D and a mean AEs of 0.54 ± 0.45 D. Based on biometry from IOLMaster only, Haigis formula had a mean NEs of 0.02 ± 0.54 D and a mean AEs of 0.41 ± 0.36 D, SRK/T formula had a mean NEs of 0.41 ± 0.54 D and a mean AEs of 0.52 ± 0.43 D, Hoffer Q formula had a mean NEs of 0.05 ± 0.58 D and a mean AEs of 0.36 ± 0.46 D, Holladay 1 formula had a mean NEs of 0.32 ± 0.45 D and a mean AEs of 0.43 ± 0.35 D. CONCLUSIONS Haigis and Hoffer Q formulas performed slightly better than SRK/T and Holladay 1 formulas. Therefore, for cataractous patients with moderate AL, all four formulas based the biometry from IOLMaster combining Topolyzer and IOLMaster only can be used for the prediction of IOL power, and the Haigis and Hoffer Q formulas are particularly recommended.

scholarly journals Axial length elongation in adults with long-standing unilateral traumatic cataract

2016 ◽  
Vol 75 (1) ◽  
Author(s):  
Jonel Steffen ◽  
Nagib Du Toit ◽  
James C. Rice ◽  
Shaheer Aboobaker
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Axial Length ◽  
Visual Deprivation ◽  
Length Difference ◽  
Intraocular Lens Power ◽  
Lens Power ◽  
Axial Myopia ◽  
Fellow Eyes ◽  
Rule Out

Background: Unilateral eye elongation with resultant axial myopia has been reported to occur secondary to visual deprivation from birth or early childhood. Acquired axial length elongation secondary to visual deprivation in adults has rarely been reported.Aim: To report acquired axial myopia in adults with visual deprivation due to long-standing unilateral traumatic cataract.Methods: Eleven consecutive adult patients who presented for cataract surgery with unilateral, long-standing, mature, traumatic cataracts and an interocular axial length difference of more than 1 mm were studied. Patients with a post-operative best corrected visual acuity (BCVA) of < 6/12 were excluded to rule out possible pre-existing anisometropic amblyopia.Results: Of the 11 patients with significant interocular axial length difference, 5 patients were excluded on the basis of possible pre-existing amblyopia. The remaining 6 patients had final BCVA of 6/12 or better. The median length of the cataractous eyes was 2.83 mm longer than the fellow eyes (range 1.12 mm – 3.52 mm). The intraocular lens power required for emmetropia was 6.8 dioptres (range 3.5 dioptres – 11.5 dioptres) less in the cataractous eyes. A refractive outcome within 1 dioptre of the target refraction was achieved in all patients. The median delay between ocular trauma and cataract surgery was 20 years (range 8–24 years).Conclusion: Significant unilateral axial length elongation may occur in adults with longstanding traumatic cataracts and visual deprivation. A potential correlation may exist between delay to surgery and degree of axial length difference. This rare phenomenon must be considered when determining intraocular lens power to avoid post-operative refractive surprises.

scholarly journals OPTIMAL SINGLE INTRAOCULAR LENS POWER (IOL) CALCULATION FOR ADULT POPULATION

1969 ◽  
Vol 4 (2) ◽  
pp. 497-502
Author(s):  
ASIF IQBAL ◽  
FAKHAR UL ISLAM ◽  
BILAL BASHIR ◽  
MOHAMMAD IDRIS ◽  
OMER KHAN ORAKZAI
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Intraocular Lens ◽  
Axial Length ◽  
Adult Population ◽  
Small Incision Cataract Surgery ◽  
Minimum Power ◽  
Intraocular Lens Power ◽  
Iol Power ◽  
Lens Power

OBJECTIVES: To determine the single optimal intraocular lens power based on average biometricassessment for adult cataract surgery in free eye camps.MATERIALS AND METHODS: Prospective observational study of 4 years duration from 1stFebruary 2010 to 31st January 2014.SETTING: Community based Trust eye hospital in Tarakai village of District Swabi.METHODS: All adult patients, undergoing cataract surgery with intraocular lens (IOL) implantationwere included in the study after informed consent and fulfilling the inclusion and exclusion criteria. Allpatients were operated by manual small incision cataract surgery by the same surgeon (AI). Preoperative and Post- operative best spectacle corrected visual acuity (BSCVA) at two months follow upwas noted. Keratometric readings (K1 & K2), axial length and IOL power were calculated and dataanalyzed by using SPSS version 20 software database.RESULTS: Out of 1500 patients with cataract 668 (44.5%) were males and 832 (55.5%) were females.Right eye was involved in 826 (55.1%) patients whereas; left eye was involved in 674 (44.9%) patients.Mean K1 reading was 44.82± 1.80 D. Mean K2 reading was 44.94± 1.80 D. Mean axial length readingwas 23.11± 1.28 mm. 36.6 ifc(n=403) patients had axial length between 23-23.99 mm. Mean IOL powerin dioptres for males was 20.06± 2.53 D with minimum power of 2.00 D, maximum was 27 D and modewas 20.00 D. Mean IOL power in dioptres for females was 20.12 ± 3.43 D with minimum power of -2.00 D, maximum was 36.50 D and mode was 20.00 D. Mean IOL power was 20.10 ± 3.06 D. In 798patients (53.2 %) IOL used was in the range of 20.00 D to 22.00 D. Pre-operative best spectaclecorrected visual acuity was <6/60 in 58.4% (n=877) patients. Post operative best corrected visual acuity6/18 or better was present in 90.5% (n= 1357) patients at two months follow up.CONCLUSION: In community eye care centers located in far-flung areas with no facilities for properbiometric assessment of cataract patients, using an IOL power in the range of 20.00 D to 22.00 D wouldgive optimal visual results.KEY WORDS: Biometry, Keratometric readings, Axial Length, Intraocular lens.

scholarly journals Refractive Surprise in Post-Cataract Surgery in Post Epi-LASIK Patient: A Lesson Learnt

2020 ◽  
Vol 19 (2) ◽  
Author(s):  
Md-Muziman-Syah MM ◽  
Mutalib HA ◽  
Khairidzan MK ◽  
Noorhazayti AH
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Contact Lens ◽  
Power Measurement ◽  
Power Calculation ◽  
Corneal Power ◽  
Intraocular Lens Power Calculation ◽  
Intraocular Lens Power ◽  
Lens Power ◽  
Lens Power Calculation

Post-myopic laser refractive surgery corneal power measurement for intraocular lens power calculation is one of the most challenging issues in cataract surgery. Standard keratometry measurement is likely to be overestimated which could lead to false-low intraocular lens power. As a result, this can lead to hyperopic surprise. Contact lens method is an alternative method which is relatively inexpensive and accessible  procedure in many optometry and ophthalmology centres. The contact lens method with optimised equations have been used for this case to obtain an accurate postoperative corneal power.

scholarly journals The Relationship between Anterior Chamber Depth, Axial Length and Intraocular Lens Power among Candidates for Cataract Surgery

10.19082/3127 ◽  
2016 ◽  
Vol 8 (10) ◽  
pp. 3127-3131 ◽  
Author(s):  
Mohammad Reza Sedaghat ◽  
Ali Azimi ◽  
Peyman Arasteh ◽  
Naghmeh Tehranian ◽  
Shahram Bamdad
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Intraocular Lens ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Intraocular Lens Power ◽  
Lens Power ◽  
The Relationship

Refractive predictability and visual outcomes of an extended range of vision intraocular lens in eyes with previous myopic laser in situ keratomileusis

2018 ◽  
Vol 29 (6) ◽  
pp. 593-599 ◽  
Author(s):  
Carlos Palomino-Bautista ◽  
David Carmona-González ◽  
Rubén Sánchez-Jean ◽  
Alfredo Castillo-Gómez ◽  
Marta Romero-Domínguez ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Laser In Situ Keratomileusis ◽  
Spherical Equivalent ◽  
Average Value ◽  
Refractive Outcomes ◽  
Intraocular Lens Power ◽  
Extended Range ◽  
Lens Power

Purpose: To evaluate the refractive predictability obtained with an extended range of vision intraocular lens in eyes with previous myopic laser in situ keratomileusis, confirming which intraocular lens power formula provides the most accurate calculation. Methods: The study enrolled 71 eyes with previous successful myopic laser in situ keratomileusis surgery of 43 patients undergoing cataract surgery with implantation of the extended range of vision intraocular lens TECNIS Symfony (Johnson and Johnson Vision). Intraocular lens power was calculated using all American Society of Cataract and Refractive Surgeons formulas, and their average value was selected for implantation. Refractive outcomes were evaluated at 3 months postoperatively. Results: Postoperative spherical equivalent within ±0.50 and ±1.00 D was found in 61.6% and 86.3% of eyes, respectively. In eyes with pre-laser in situ keratomileusis data available, no significant correlation was found between pre-laser in situ keratomileusis spherical equivalent and post-cataract surgery spherical equivalent (r = 0.237, p = 0.114). A postoperative spherical equivalent within ±0.50 D was found in 65.2% and 55.6% of eyes in the subgroups with and without pre-laser in situ keratomileusis data available, respectively (p = 0.480). Statistically significantly higher differences between the intraocular lens power implanted and the calculation provided by the Potvin–Hill (p = 0.028) and Barrett True K No History formulas (p = 0.022) were found in those eyes with postoperative spherical equivalent > 0.50 D. Conclusion: The extended range of vision intraocular lens evaluated can provide a predictable refractive correction in eyes with previous laser in situ keratomileusis surgery. The Potvin–Hill and Barrett True K No History are the most adequate formulas to perform intraocular lens power calculations in these cases.

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