Colors before and after cataract surgery: A study of color constancy and discrimination

Cataract surgery replaces the aged human lens with a transparent silicone implant. The new lens removes optical distortions and light scattering media, as well as a yellow filter. This talk describes the appearances of natural scenes before and after cataract surgery. While Color Constancy experiments showed small changes, color discrimination experiments had large changes. These results provide a mechanistic signature of Color Constancy and Discrimination.

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CLINICAL CHARACTERISTICS AND RESULTS OF CATARACT SURGERY IN THE SMALL PUPIL EYE BY PHACOEMUSIFICATION

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2018.2.13 ◽

2018 ◽

pp. 79-82

Author(s):

Van Minh Pham ◽

Van Nam Phan ◽

Thi Thu Nguyen

Keyword(s):

Visual Acuity ◽

Cataract Surgery ◽

Clinical Characteristics ◽

Low Vision ◽

Sample Selection ◽

Posterior Chamber ◽

Good Visual Acuity ◽

Before And After ◽

Grade Ii ◽

Small Pupil

Objectives: To investigate the clinical characteristics of cataract patients with small pupils and to evaluate the result of cataract surgery on the eye have small pupils by phacotechnique. Subjects and methods: Descriptive study, prospective, uncontrolled interventions. Sample selection. The sample size of 70 patients with 70 eyes of cataracts with small pupils was treated by phaco technique and intraocular lens implant within posterior chamber. Follow up to 3 months. Results: 70 eyes, the percentage of men and women was not different from 54.2% (38 male) compared to 45.8% (32 female). The mean age was 80 ± 8.74, from 58 to 99 years. The disease was mainly found in the age group over 70 years old with over 80% (51.5%). Visual acuity before surgery was very poor under 3m CF (count finger) for 68.6% (48/70). Visual acuity over 1/10 was only a small amount with 2.8% (2 eyes). Pseudoexfoliation was the most common reason complications of mydriasis with 32/70 eyes (45.7%) and 22/70 eyes (31.4%) for age. The preoperative pupilarysizewas mostly small with 63/70 eyes (90.0%), non-dilated pupils (7/70 eyes) (10.0%). Average pupil size was 3.34 mm (2 - 4mm). Iris condition: iris atrophy 20/10 eyes (28.6%), iris synechiae 11/10 (15.7%), irregular iris muscle with 51, 4% and good iris muscle accounted for 48.6%. Grade of cataract: Grade III: 31/70 eyes (44.3%), Grade IV: 32/70 eyes (45.7%), Grade II: 5/70 eyes (7.1%) and V:2/70 eyes (2.9%). Pupil expander technique: OVD injection with 42/70 eyes (60%), using iris hook with 23/70 eyes (32.9%). Pupillary size before and after intervention has changed from 3.7mm to 4.48mm. Conclusions: Iris expander techniques have been shown to have good dilated pupils: 60.0% OVD injection, iris hook was 32.9%, other methods 7.1% One-week visibility of good visual acuity was higher than that of postoperative one day (12.2%) and increased at 1 month and 3 months (20.0%). Very good visual acuity was not available and low vision group was 1.4% after 3 months. Key words: cataract surgery; phacoemusification, small pupil

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Validity of the French version of Catquest-9SF and use of an electronic notepad for entering patient-reported outcome measures

Eye and Vision ◽

10.1186/s40662-021-00233-7 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Gregory Katz ◽

Alexandra Rouquette ◽

François Lignereux ◽

Thierry Mourgues ◽

Michel Weber ◽

...

Keyword(s):

Cataract Surgery ◽

Psychometric Properties ◽

Rasch Analysis ◽

Item Difficulty ◽

Patient Reported Outcome Measures ◽

Patient Reported Outcome ◽

Good Precision ◽

French Version ◽

Patient Reported ◽

Before And After

Abstract Background The Catquest-9SF questionnaire is a patient reported outcome measure that quantifies the visual benefits from cataract surgery. The purpose of this study was to translate and adapt the Catquest-9SF questionnaire for France, to assess its psychometric properties via Rasch analysis, and to assess its validity when completed using an electronic notepad. Methods The Catquest-9SF questionnaire was translated following the guidelines of the International Society for Pharmacoeconomics and Outcomes Research. Catquest-9SF and clinical data were collected from patients before and after routine cataract surgery. All questionnaire data were collected via an electronic notepad. Rasch analysis was performed to assess psychometric properties, and sensitivity to change was analysed for patients with complete paired pre- and post-operative questionnaires. Results A complete filled-in preoperative questionnaire was obtained for 848 patients. Rasch analysis showed good precision (person separation: 2.32, person reliability: 0.84), ordered category probability curves, no item misfit, and unidimensionality. The respondents were slightly more able than the level of item difficulty (targeting: −1.12 logits). Sensitivity was analysed on 211 paired questionnaires, and the postoperative questionnaires showed a clear ceiling effect. The effect size was 2.6. The use of an electronic notepad for completing the questionnaire worked out very well after some adjustments. Conclusions The French version of Catquest-9SF has good psychometric properties and is suitable for use in French-speaking patients. The use of the Catquest-9SF questionnaire in an electronic format showed good validity.

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Comparison of Goldmann applanation and dynamic contour tonometry before and after cataract surgery

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2011.11.034 ◽

2012 ◽

Vol 38 (4) ◽

pp. 683-689 ◽

Cited By ~ 10

Author(s):

Mitja A. Heinrich ◽

Timo Eppig ◽

Achim Langenbucher ◽

Sven Walter ◽

Wolfgang Behrens-Baumann ◽

...

Keyword(s):

Cataract Surgery ◽

Dynamic Contour Tonometry ◽

Before And After

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In Vivo Measurements On Human Lens Using Quasielastic Light Scattering

10.1117/12.937336 ◽

1987 ◽

Author(s):

Peter C. Magnante ◽

Leo T. Chylack ◽

George B. Benedek ◽

Teodosio Libondi ◽

Stephen N. Joffe ◽

...

Keyword(s):

Light Scattering ◽

Human Lens ◽

Quasielastic Light Scattering ◽

In Vivo Measurements

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Triggerfish Recording of IOP Patterns in Combined HFDS Minimally Invasive Glaucoma and Cataract Surgery: A Prospective Study

Journal of Clinical Medicine ◽

10.3390/jcm10163472 ◽

2021 ◽

Vol 10 (16) ◽

pp. 3472

Author(s):

Bojan Pajic ◽

Mirko Resan ◽

Brigitte Pajic-Eggspuehler ◽

Horace Massa ◽

Zeljka Cvejic

Keyword(s):

Circadian Rhythm ◽

Intraocular Pressure ◽

Minimally Invasive ◽

Prospective Study ◽

Cataract Surgery ◽

High Frequency ◽

Glaucoma Surgery ◽

Before And After ◽

Contact Lens Sensor ◽

A Prospective Study

Background: The aim of the study is to investigate whether the circadian IOP rhythm can be influenced by combined cataract surgery with high frequency deep sclerotomy (HFDS) and whether intraocular pressure (IOP) can be significantly reduced by HFDS. Methods: In our study 10 patients were included, in whom 24 h IOP monitoring was installed before and after HFDS/cataract surgery using a Triggerfish. HFDS is a minimally invasive glaucoma surgery (MIGS). Results: After performed HFDS combined with cataract surgery, the IOP was reduced from 27.7 ± 2.11 mmHg to 14.4 ± 2.59 mmHg, which is highly significant (p < 0.001). The contact lens sensor (CLS) cosinor analysis pre- and postoperatively showed that the circadian rhythm is not influenced by the surgery, i.e., the circadian IOP rhythm did not show significant differences before and after surgery. Conclusions: HFDS combined with cataract surgery is a potent surgical method that can significantly reduce the IOP. However, the circadian rhythm cannot be changed by the surgery. The acrophase remained during the night in all patients.

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Distribution of preoperative and postoperative astigmatism in a large population of patients undergoing cataract surgery in the UK

British Journal of Ophthalmology ◽

10.1136/bjophthalmol-2018-312025 ◽

2018 ◽

Vol 103 (7) ◽

pp. 993-1000 ◽

Cited By ~ 10

Author(s):

Alexander C Day ◽

Mukesh Dhariwal ◽

Michael S Keith ◽

Frank Ender ◽

Caridad Perez Vives ◽

...

Keyword(s):

Visual Acuity ◽

Cataract Surgery ◽

Large Population ◽

Corneal Astigmatism ◽

Postoperative Astigmatism ◽

Before And After ◽

Significant Burden ◽

Uk National Health Service ◽

The Uk ◽

Refraction Data

PurposeTo assess the prevalence and severity of preoperative and postoperative astigmatism in patients with cataract in the UK.SettingData from 8 UK National Health Service ophthalmology clinics using MediSoft electronic medical records (EMRs).DesignRetrospective cohort study.MethodsEyes from patients aged ≥65 years undergoing cataract surgery were analysed. For all eyes, preoperative (corneal) astigmatism was evaluated using the most recent keratometry measure within 2 years prior to surgery. For eyes receiving standard monofocal intraocular lens (IOLs), postoperative refractive astigmatism was evaluated using the most recent refraction measure within 2–12 months postsurgery. A power vector analysis compared changes in the astigmatic 2-dimensional vector (J0, J45) before and after surgery, for the subgroup of eyes with both preoperative and postoperative astigmatism measurements. Visual acuity was also assessed preoperatively and postoperatively.ResultsEligible eyes included in the analysis were 110 468. Of these, 78% (n=85 650) had preoperative (corneal) astigmatism ≥0.5 dioptres (D), 42% (n=46 003) ≥1.0 D, 21% (n=22 899) ≥1.5 D and 11% (n=11 651) ≥2.0 D. After surgery, the refraction cylinder was available for 39 744 (36%) eyes receiving standard monofocal IOLs, of which 90% (n=35 907) had postoperative astigmatism ≥0.5 D and 58% (n=22 886) ≥1.0 D. Visual acuity tended to worsen postoperatively with increased astigmatism (ρ=−0.44, P<0.01).ConclusionsThere is a significant burden of preoperative astigmatism in the UK cataract population. The available refraction data indicate that this burden is not reduced after surgery with implantation of standard monofocal IOLs. Measures should be taken to improve visual outcomes of patients with astigmatic cataract by simultaneously correcting astigmatism during cataract surgery.

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COMPARISON OF VISION OUTCOMES BETWEEN SICS (SMALL-INCISION CATARACT SURGERY) AND PHACOEMULSIFICATION IN CATARACT SURGERY

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2020.v13i12.39552 ◽

2020 ◽

pp. 64-68

Author(s):

NAVYA SAI K ◽

SUHAS REDDY C ◽

SRILEKHA K ◽

AVANTHI PRIYA K

Keyword(s):

Medication Adherence ◽

Cataract Surgery ◽

Small Incision Cataract Surgery ◽

Small Incision ◽

Number Of Patients ◽

Disease Condition ◽

Before And After ◽

Adherence Scale ◽

Visual Function Questionnaire ◽

Scale 8

Objectives: The main objective of the study is to compare the vision outcomes between small-incision cataract surgery (SICS) and phacoemulsification (PHACO) procedures, to compare the quality of life (QOL) before surgery and after surgery, to improve the patient’s knowledge of their disease condition, and to increase medication adherence after the surgery. Methods: A prospective observational study was conducted for 6 months. About 100 patients were enrolled in the study according to the study criteria. Different scales ([visual function questionnaire] VFQ 25, QOL scale [QOLS] by Schalock and Keith, Morisky Adherence Scale -8 items) were scored from the patient’s profile and treatment chart by communicating with physicians, counseling the patients. Results: One hundred patients were assessed before and after cataract surgery and follow-up was made for 1 month. Overall, vision-related QOL was significantly improved in PHACO than SICS patients. National Eye Institute VFQ 25 was assessed on day 7 and day 30 where we have observed a statistically significant improvement in the PHACO group of patients than in SICS. Their medication adherence scores were categorized into a high, medium, low category, and most of the SICS patients remained in the medium category, whereas the number of patients increased from medium to high category in PHACO patients. Conclusion: We concluded that PHACO is better than small incisional cataract surgery due to its small and self-sealing incision, which requires no stitches in most cases, with minimum complications the patient heals faster and recovers rapidly.

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Accelerated corneal endothelial cell loss in two patients with granulomatosis with polyangiitis following phacoemulsification

BMC Ophthalmology ◽

10.1186/s12886-020-01752-y ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Fang-Chi Hsiao ◽

Hung-Ta Chen ◽

Kuan-Jen Chen ◽

Yi-Jen Hsueh ◽

Yaa-Jyuhn James Meir ◽

...

Keyword(s):

Endothelial Cells ◽

Cataract Surgery ◽

Granulomatosis With Polyangiitis ◽

Corneal Edema ◽

Cell Loss ◽

Multiple Organs ◽

First Case ◽

Before And After ◽

The Right

Abstract Background Generally, the loss rate of human endothelial cells (HCEC) in routine cataract surgery is 8.5%. When the corneal endothelial cells density (ECD) drops, the HCEC may decompensate to keep cornea dehydration which leads to corneal edema. Granulomatosis with polyangiitis (GPA) is an uncommon autoimmune disease involving multiple organs including eyes such as conjunctivitis, scleritis, uveitis, and corneal ulcer. In this study, we report two cases of GPA whose corneal ECD decreased significantly after phacoemulsification cataract surgery. Case presentation In the first case of 69-year-old male with GPA, the ECD dropped 39.6% (OD) four months after phacoemulsification and 38.1% (OS) six months postoperatively respectively. At the final follow-up, the residual ECD was only 55% in the right eye in the 49th month, and 56% remained in the left eye in the 39th month. In the second case of 54-year old female, left ECD dropped 63.9% at the 4th month after surgery and 69.6% ECD remained at the 15th month postoperatively while similar ECD of right eye before and after left eye surgery. Conclusion Extensive preoperative ophthalmic evaluation and meticulous postoperative inflammation control should be applied to prevent severe loss of HCEC in GPA patients.

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