scholarly journals Comparison of Intraocular Pressure before and after Laser In Situ Keratomileusis Refractive Surgery Measured with Perkins Tonometry, Noncontact Tonometry, and Transpalpebral Tonometry

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Isabel Cacho ◽  
Juan Sanchez-Naves ◽  
Laura Batres ◽  
Jesús Pintor ◽  
Gonzalo Carracedo
Keyword(s):  
Intraocular Pressure ◽  
Refractive Surgery ◽  
Corneal Thickness ◽  
Laser In Situ Keratomileusis ◽  
Spherical Equivalent ◽  
Transpalpebral Tonometry ◽  
Spherical Equivalent Refraction ◽  
Before And After ◽  
Noncontact Tonometry

Purpose. To compare the intraocular pressure (IOP) before and after Laser In Situ Keratomileusis (LASIK), measured by Diaton, Perkins, and noncontact air pulse tonometers.Methods. Fifty-seven patients with a mean age of 34.88 were scheduled for myopia LASIK treatment. Spherical equivalent refraction (SER), corneal curvature (K), and central corneal thickness (CCT) and superior corneal thickness (SCT) were obtained before and after LASIK surgery. IOP values before and after surgery were measured using Diaton, Perkins, and noncontact air pulse tonometers.Results. The IOP values before and after LASIK surgery using Perkins tonometer and air tonometers were statistically significant (p<0.05). However, no significant differences were found (p>0.05) for IOP values measured with Diaton tonometer. CCT decreases significantly after surgery (p<0.05) but no statistical differences were found in SCT (p=0.08). Correlations between pre- and postsurgery were found for all tonometers used, withp=0.001andr=0.434for the air pulse tonometer,p=0.008andr=0.355for Perkins, andp<0.001andr=0.637for Diaton.Conclusion. Transpalpebral tonometry may be useful for measuring postsurgery IOP after myopic LASIK ablation because this technique is not influenced by the treatment.

scholarly journals Accommodation Amplitude Before and After Laser In Situ Keratomiletus (LASIK) In Myopic Patients

2020 ◽  
Vol 3 (1) ◽  
pp. 1-18
Author(s):  
Bonita Asyigah ◽  
Ani Ismail
Keyword(s):  
Visual Acuity ◽  
Intraocular Pressure ◽  
Refractive Surgery ◽  
Laser In Situ Keratomileusis ◽  
Adaptation Mechanism ◽  
Near Vision ◽  
Before And After ◽  
Center Hospital

ABSTRACT Introductions: Laser in situ Keratomileusis (LASIK) is the most common refractive surgery to treat myopia. One of the most common complain after this procedure is blurry near- vision. Objectives: To evaluate the role of accommodation amplitude (AA) in myopic patients before and after LASIK and its effect to blurry near-vision in myopic patients after LASIK Methods: Patients with myopia who underwent LASIK procedure in Sriwijaya Eye Center Hospital from January to February 2018 studied prospectively. AA was assessed before and after LASIK with 1 day, 1 week and 1 month. Myopia degree, intraocular pressure (IOP), age, gender, ablation and corneal profile were also assessed. Results: A total 52 eyes from 32 patients were included. Visual acuity (VA) of all sample were significantly improve in 1 day after LASIK (p 0,001). Mean AA in myopic patients before LASIK 9,25 D and AA 1 day after LASIK were all significantly decrease into 9,00D (p 0,012) which can cause in blurry near- vision after LASIK. In 1 month followed-up, mean AA is significantly improved into 11,00 D (p 0,000) with no complain. Other factor that affect the changing AA were corneal cell density (CD), IOP and AA before LASIK. Conclusions: There is significant AA difference in myopic patients before and after LASIK. Blurry near-vision after LASIK is caused by AA adaptation mechanism after LASIK.

Correlation of intraocular pressure and central corneal thickness in normal myopic eyes and after laser in situ keratomileusis

1998 ◽  
Vol 24 (10) ◽  
pp. 1320-1325 ◽  
Author(s):  
Barry Emara ◽  
Louis E. Probst ◽  
David P. Tingey ◽  
Dennis W. Kennedy ◽  
Lisa J. Willms ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Laser In Situ Keratomileusis

The Effect of Astigmatism Axis on Visual Acuity

2016 ◽  
Vol 27 (3) ◽  
pp. 308-311 ◽  
Author(s):  
Michael Mimouni ◽  
Achia Nemet ◽  
Russell Pokroy ◽  
Tzahi Sela ◽  
Gur Munzer ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Refractive Surgery ◽  
Laser In Situ Keratomileusis ◽  
Stepwise Multiple Regression ◽  
Spherical Equivalent ◽  
Tel Aviv ◽  
Uncorrected Distance Visual Acuity ◽  
Laser Refractive Surgery ◽  
Better Than

Purpose To evaluate the effect of astigmatism axis on uncorrected distance visual acuity (UDVA) in emmetropic eyes that underwent laser refractive surgery. Methods This retrospective study included patients who underwent laser in situ keratomileusis or photorefractive keratectomy between January 2000 and December 2015 at the Care-Vision Laser Centers, Tel Aviv, Israel. Eyes with a 3-month postoperative spherical equivalent between -0.5 D and 0.5 D were included in this study. Eyes with ocular comorbidities and planned ametropia were excluded. Study eyes were divided into 3 groups according to the steep astigmatic axis: with the rule (WTR) (60-120), oblique (31-59 or 121-149), and against the rule (ATR) (0-30 or 150-180). The UDVA of these 3 groups was compared. The oblique group was divided into oblique ATR and oblique WTR, which were compared with each other. Results A total of 17,416 consecutive eyes of 8,708 patients were studied. The WTR eyes (n = 10,651) had significantly better UDVA (logMAR 0.01 ± 0.08) than the oblique (n = 3,141, logMAR 0.02 ± 0.09) and ATR eyes (n = 3,624, logMAR 0.02 ± 0.10) (p<0.001). The oblique WTR group had significantly better UDVA than the oblique ATR group (p<0.001). The UDVA of the oblique and ATR groups was similar. Stepwise multiple regression analysis showed that the group accounted for 15% of the UDVA variance (p = 0.04). Conclusions The astigmatic axis has a small but significant effect on UDVA in emmetropic eyes; WTR was better than oblique and ATR astigmatism. Therefore, when correcting astigmatism, it may be preferable to err towards WTR astigmatism.

Comparison of Intraocular Pressure before and after Laser in Situ Keratomileusis Measured with Applanation Tonometry, Non Contact Tonometry and Rebound Tonometry

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Fatma Gebreel Ahmed Gaber ◽  
Tamer Mohamed El- Raggal ◽  
Mohamed Gamil Metwally ◽  
Ahmed Abdelmonsef Ebeid
Keyword(s):  
Intraocular Pressure ◽  
Central Corneal Thickness ◽  
Open Angle Glaucoma ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Goldmann Applanation Tonometry ◽  
Rebound Tonometry ◽  
Different Types ◽  
Before And After

Abstract Background Measurement of intraocular pressure (IOP) plays a central role throughout ophthalmology. It is part of routine ophthalmologic examinations and important in the management and follow-up of patients with glaucoma. While elevated IOP remains the most important risk factor for development and progression of open angle glaucoma, at least half of the population diagnosed with open angle glaucoma is asymptomatic. Objectives The aim of our study is to compare the accuracy of intraocular pressure measurement before and after Laser in situ keratomeulsis (LASIK) surgery using three different types of Tonometers: Goldmann Applanation tonometry (GAT), Non contact tonometry (NCT) and Rebound tonometry (I care), considering the change in the central corneal thickness (CCT). Patients and Methods In this study Eighty eyes of 40 patients with mean age of 27.00±6.00 years were scheduled for LASIK..Central corneal thickness before and after surgery was obtained by Ultrasound (US) pachymetry.IOP values were measured before and after surgery using three different types of Tonometers: Goldmann Applanation tonometry, Non contact tonometry and Rebound tonometry. Results The results revealed that lower post-operative IOP measurements using all techniques. The least affected technique was Non –contact with IOP change 16%, followed by GAT with IOP change 18%, and finally Rebound with IOP change 19 %, respectively. The percentage of change in CCT between pre- and post- LASIK surgery measured with the Ultrasound pachymetry was statistically highly significant. There was a clinical significant correlation between Percentage of tissue ablation (PTA) and IOP change for GAT, NCT and rebound tonometry. Also, there was a significant correlation between Residual stromal bed (RSB) and IOP change for GAT and NCT. There was no clinical significant correlation between Ablation depth (AD) and percentage of change of IOP measurements pre and post LASIK, except for IOP measured with GAT when AD &lt; 40.00 µm. Conclusion Refractive surgery causes significant lowering of IOP as measured using Goldmann applanation tonometry, non contact tonometry and rebound tonometry. The least affected tonometry post LASIK is non contact tonometry. The reduction was correlated to the percentage of tissue ablated. The ideal method to measure IOP in post-LASIK patients would be a device that is free of corneal factors.

scholarly journals Outcomes of Refractive Surgery Consultations at an Academic Center: Characteristics Associated with Proceeding (or Not Proceeding) with Surgery

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Irene C. Kuo ◽  
Benjamin Lee ◽  
Jiangxia Wang
Keyword(s):  
Refractive Surgery ◽  
Laser In Situ Keratomileusis ◽  
Spherical Equivalent ◽  
Implantable Collamer Lens ◽  
High Patient Satisfaction ◽  
Academic Center ◽  
Johns Hopkins University ◽  
Technological Limitations

Objective. Refractive surgery volume has not rebounded despite economic recovery and literature describing safety, efficacy, and high patient satisfaction. We sought to examine characteristics of consultation seekers and status after consultation. Methods. Charts of patients seeking refractive surgery at Johns Hopkins University from 2013 through 2016 were retrospectively reviewed for age, gender, refractive characteristics, and outcome: surgery (photorefractive keratectomy, laser in-situ keratomileusis, implantable collamer lens, or refractive lens exchange); no surgery—“lost candidate” (good candidates who were lost after consultation); noncandidates based on technological limitations or contraindications; or no surgery—possessing expectations that surgery would not meet. Associations between characteristics and status after consultation were examined. Results. Twenty percent (142/712) of all patients were “lost candidates”; 57% (408/712) completed surgery. More women (56% or 401/712) sought consultation, but a greater percentage (63% or 195/311) of men completed surgery than women did (53% or 213/401) p=0.02. Of consultation seekers, 60% were low myopes, 29% were high myopes (>6 diopters of myopic spherical equivalent), and 11% were hyperopes. Surgical patients’ mean age was 34.2 ± 10.2 (standard deviation) years; for each additional year of age, patients were less likely to have surgery p<0.001. Hyperopes were ≥3 times more likely than myopes to have expectations not met by surgery or to be noncandidates than to have surgery p<0.005. Conclusions. Most patients seeking refractive surgery had 6 diopters or less of myopia. About 20% of patients were lost after consultation; better counseling and follow-up of candidates may be warranted. Expectations and technology limit eligibility for many, especially hyperopes. Low surgery volume may affect training of future refractive surgeons.

scholarly journals Changes in Intraocular Pressure and Factors that Influence such Changes after FS-LASIK and SMILE

2021 ◽  
Vol 62 (10) ◽  
pp. 1355-1363
Author(s):  
Bu Ki Kim ◽  
Young Taek Chung
Keyword(s):  
Intraocular Pressure ◽  
Linear Regression Analysis ◽  
Corneal Thickness ◽  
Study Data ◽  
Laser In Situ Keratomileusis ◽  
Group Differences ◽  
Simple Linear Regression ◽  
Lenticule Extraction ◽  
The Relationship

Purpose: We compared the intraocular pressure (IOP) changes and the relationships thereof with corneal biomechanics after small incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK).Methods: A total of 234 eyes of 117 patients who underwent FS-LASIK surgery and 244 eyes of 122 patients who underwent SMILE surgery were included in this retrospective study. Data were collected preoperatively, and at 1, 3, and 6 months postoperatively, including IOP measured via non-contract tonometry, central corneal thickness (CCT), and mean keratometry (Km), flat keratometry (Kf), and steep keratometry (Ks) data obtained using a dual Scheimpflug analyzer. Between-group differences were compared. Simple linear regression analysis was used to determine the relationship between changes in the IOP and the various parameters.Results: The IOP changes were 5.41 ± 2.28 mmHg in the FS-LASIK group and 4.77 ± 2.38 mmHg in the SMILE group, thus significantly different (p = 0.004). The IOP did not change significantly from 1 to 6 months after FS-LASIK but increased significantly from 12.07 ± 1.77 mmHg at 3 months postoperatively to 12.77 ± 1.89 mmHg at 6 months postoperatively after SMILE (p = 0.002). All of the preoperative spherical equivalent and IOP, and changes in the Km, Kf, Ks, and CCT, were significantly associated with the IOP changes in both groups. The preoperative IOP evidenced the strongest relationship with the IOP changes in both groups (R2 = 0.414 in the FS-LASIK group, R2 = 0.292 in the SMILE group).Conclusions: The IOP fell significantly after FS-LASIK and SMILE surgery, significantly more so after FS-LASIK than SMILE. The preoperative IOP exhibited the greatest influence on the IOP decreases after both FS-LASIK and SMILE.

scholarly journals Evaluating the Ectasia Risk Score System in Cancelled Laser In Situ Keratomileusis Candidates

2020 ◽  
Author(s):  
Mehrdad Mohamadpour ◽  
Masoud Khorrami-Nejad ◽  
Mohammad Yaser Kiarudi ◽  
Keivan Khosravi
Keyword(s):  
Risk Score ◽  
Corneal Thickness ◽  
Laser In Situ Keratomileusis ◽  
Spherical Equivalent ◽  
Score System ◽  
Manifest Refraction ◽  
Bed Thickness ◽  
The Mean ◽  
Risk Score System

Purpose: To evaluate the ectasia risk score system in cancelled laser in situ keratomileusis (LASIK) candidates at an academic hospital. Methods: LASIK candidates who had been cancelled by a surgeon considering the patient age, preoperative central corneal thickness, residual stromal bed thickness, or preoperative manifest refraction spherical equivalent were retrospectively reviewed, and their Randleman ectasia risk score system score was calculated. Results: The mean ectasia score of 194 eyes (97 patients) was 4.5 ± 2.67; 40 (20.6%), 46 (23.7%), and 108 (55.7%) eyes were classified as low-, moderate-, and high-risk eyes, respectively. The topography was abnormal in 69% of the patients. The mean manifest refraction spherical equivalent, central corneal thickness, and estimated residual stromal bed thickness were 4 (+0.50 to –15.50) diopters, 520 (439 to 608) μm, and 312.38 (61.5 to 424.12) μm, respectively. The main cause of cancellation in low- and moderate-risk patients (86 eyes) was the presence of unstable refractive error in the past year. Conclusion: Although promising, some other criteria, such as stable refraction, should be added to this scoring system to achieve greater practicality since a main cause of cancelling LASIK candidates in this study was the presence of unstable refraction.

scholarly journals Long-term Outcomes of Femtosecond Laser-assisted Laser in situ Keratomileusis for Anisometropic Amblyopia in Children with Hyperopia

2018 ◽  
Vol 15 (2S) ◽  
pp. 46-51
Author(s):  
I. L. Kulikova ◽  
N. V. Chapurin
Keyword(s):  
Refractive Surgery ◽  
Functional Results ◽  
Laser In Situ Keratomileusis ◽  
Spherical Equivalent ◽  
Long Term Outcomes ◽  
Fellow Eye ◽  
Anisometropic Amblyopia ◽  
General Period

Objective: analysis of remote clinical functional results of femtolaser-assisted laser in situ keratomileusis (FS-LASIK) in children with hyperopia and anisometropic amblyopia.Patients and methods: 30 children aged 5–13 (7.9 ± 2.3) years were in the study. FS-LASIK refined technology surgery was rendered to all children under general anesthesia at amblyopic eye, previously they had no success of conservative treatment. Mean spherical equivalent of refraction (SE) of amblyopic eye was +5,08 ± 1.64 D in conditions of cycloplegia. Mean SE anisometropia was 3,42 ± 1.92 D, difference in refraction between eyes was statistically significant (pmu = p < 0,001) in all patients. There was 43.3% of severe amblyopia, 56.7% cases of moderate amblyopia. General period of control was 5 years.Results: In 5 years after FS-LASIK SE of operated eye was +1.02 ± 0.28 D, predictability of refractive effect within ±0.5 D was 47%, ±1.0 D was 77% of cases. All patients gained 1–5 lines, UDVA was 0,5 and higher in 61% of cases. There were 6.7% of cases with moderate amblyopia, mild –80%, and amblyopia absence –13.3 % of cases. SE anisometropia decreased 2,37 ± 1.17 and was 0,18 ± 1.05 D, difference between operated and fellow eye was minor, but statistically significant (pmu = p < 0,05). Trend to myopisation of fellow eye was revealed.Conclusion: remote clinical functional results of FS-LASIK in correction of hyperopic anisometropia in children show safety and efficacy of interference. Refractive surgery in children should be considered not as an independent method of treatment, but in complex with conservative methods of amblyopia treatment. 

scholarly journals Effect of Mydriasis-Caused Intraocular Pressure Changes on Corneal Biomechanical Metrics

2021 ◽  
Vol 9 ◽  
Author(s):  
Yufeng Ye ◽  
Yi Li ◽  
Zehui Zhu ◽  
Anas Ziad Masoud Abu Said ◽  
Kevin Nguelemo Mayopa ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Disease Progression ◽  
Refractive Surgery ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Medical Procedures ◽  
Corvis St ◽  
Before And After ◽  
The Mean ◽  
Pressure Changes

Purpose: To evaluate the dependence of biomechanical metrics on intraocular pressure (IOP).Methods: 233 refractive surgery patients were included in this study—all were examined 3 times with the Corvis ST before and after dilation, and the differences (∆) in the main device parameters were assessed. The data collected included the biomechanically corrected IOP (bIOP), the central corneal thickness (CCT), and six dynamic corneal response (DCR) parameters, namely DA, DARatio2mm, IIR, SP-A1, CBI, and SSI. Participants were divided into three groups according to the changes in patients’ bIOP after mydriasis.Results: Intra-operator repeatability was generally high in most of the DCR parameters obtained before and after dilation. The mean changes in bIOP and CCT after dilation were −0.12 ± 1.36 mmHg and 1.95 ± 5.23 μm, respectively. Only ∆DARatio2mm, ∆IIR, and ∆CBI exhibited a statistically significant correlation with ∆CCT (p &lt; 0.05). The changes in all DCR parameters, especially ∆DA and ∆SP-A1 were also correlated with ∆bIOP (p &lt; 0.01)—a 1-mmHg change in bIOP was associated, on average, with 5.612 and −0.037 units of change in SP-A1 and DA, respectively. In contrast, the weakest correlation with ∆bIOP was exhibited by ∆SSI.Conclusion: Most corneal DCR parameters, provided by the Corvis ST, were correlated with IOP, and more weakly with CCT. Changes experienced in CCT and IOP should therefore be considered in studies on corneal biomechanics and how it is affected by disease progression and surgical or medical procedures.

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