Computer Measurement of Central Visual Acuity under Mesopic and Glare Conditions in Eyes with Nuclear Cataract

2015 ◽  
Vol 08 (06) ◽  
Author(s):  
Walter Gutstein ◽  
Stephen H Sinclair
Keyword(s):  
Visual Acuity ◽  
Nuclear Cataract ◽  
Computer Measurement

scholarly journals Objective quantification of lens nuclear opacities using swept-source anterior segment optical coherence tomography

2021 ◽  
pp. bjophthalmol-2020-318334
Author(s):  
Wei Wang ◽  
Jiaqing Zhang ◽  
Xiaoxun Gu ◽  
Xiaoting Ruan ◽  
Xiaoyun Chen ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
Anterior Segment ◽  
Training Dataset ◽  
Dissipated Energy ◽  
Nuclear Density ◽  
Optical Coherence ◽  
Nuclear Cataract ◽  
Swept Source ◽  
Ultrasonic Time

Background/aimsThe primary objective is to quantify the lens nuclear opacity using swept-source anterior segment optical coherence tomography (SS-ASOCT) and to evaluate its correlations with Lens Opacities Classification System III (LOCS-III) system and surgical parameters. The secondary objective is to assess the diagnostic performance for hard nuclear cataract.MethodsThis cross-sectional study included 1222 patients eligible for cataract surgery (1222 eyes). The latest SS-ASOCT (CASIA-2) was used to obtain high-resolution lens images, and the average nuclear density (AND) and maximum nuclear density (MND) were measured by a custom ImageJ software. Spearman’s correlations analysis was used to assess associations of AND/MND with LOCS-III nuclear scores, visual acuity and surgical parameters. The subjects were then split randomly (9:1) into the training dataset and validating dataset. Receiver operating characteristic curves and calibration curves were constructed for the classification on hard nuclear cataract.ResultsThe AND and MND from SS-ASOCT images were significantly correlated with nuclear colour scores (AND: r=0.716; MND: r=0.660; p<0.001) and nuclear opalescence scores (AND: r=0.712; MND: r=0.655; p<0.001). The AND by SS-ASOCT images had the highest values of Spearman’s r for preoperative corrected distance visual acuity (r=0.3131), total ultrasonic time (r=0.3481) and cumulative dissipated energy (r=0.4265). The nuclear density had good performance in classifying hard nuclear cataract, with area under the curves of 0.859 (0.831–0.886) for AND and 0.796 (0.768–0.823) for MND.ConclusionObjective and quantitative evaluation of the lens nuclear density using SS-ASOCT images enable accurate diagnosis of hard nuclear cataract.

scholarly journals Retinal Detachment After Cataract Surgery and Posterior Laser Capsulotomy in a Young Healthy Male Patient: Case Report

2020 ◽  
pp. 1-3
Author(s):  
Marco Zeppieri ◽  
Marco Zeppieri
Keyword(s):  
Risk Factors ◽  
Visual Acuity ◽  
Retinal Detachment ◽  
Cataract Surgery ◽  
Intraocular Lens ◽  
Vision Loss ◽  
Nuclear Cataract ◽  
Cataract Formation ◽  
Laser Treatments ◽  
Visual Acuity Loss

Background: The onset of cataract formation is normally experienced in senile age. The process of lens opacification can also be influenced by other factors, including systemic diseases, infection, trauma, medication, ultraviolet light exposure, genetic predisposition and environmental sources. Gradual vision loss accompanied by a myopic refractive shift can be caused by nuclear cataract formation, even in young patients. Phacoemulsification cataract removal and intraocular lens insertion surgery is indicated when visual acuity loss and/or myopic anisometropia becomes a problem. Surgical and laser treatments are risk factors in developing retinal detachment, especially in myopic patients. Case Presentation: This is a case of an early onset nuclear cataract in a young male. A 44-year-old man visited the hospital complaining of gradual vision loss in his right eye. History study revealed no systemic or ophthalmic diseases or trauma. The patient underwent phacoemulsification nuclear cataract removal and intraocular lens insertion surgery in his right eye, followed by Nd:YAG laser posterior capsulotomy 3 years later. He underwent phacoemulsification nuclear cataract surgery in his left eye at the age of 48 years, followed by laser capsulotomy treatment 2 years later. At the age 50, a routine eye examination revealed retinal detachment in his right eye. He underwent vitrectomy surgery twice. Conclusion: Nuclear lens opacification is seldom of clinical importance in young healthy adult patients; however, it can be the cause of progressive visual acuity loss, especially in the presence of a myopic refractive shift. Surgery, laser treatment and myopia are all risk factors in retinal detachment. This case shows that thorough and periodic routine eye examinations are a must when dealing with patients with unexpected and atypical signs and symptoms, especially having underwent surgery and laser treatments.

scholarly journals EFFECT OF NIRGUNDI (VITEX NEGUNDO LINN.) PATRA ARKA AS ASCHOTHANA (EYE DROPS) IN CATARACT-A CLINICAL STUDY

2020 ◽  
pp. 13-21
Author(s):  
Dhanisha B K* ◽  
C S Kannadas ◽  
Kusumam Joseph ◽  
V Sahasranamam ◽  
Annie Abraham
Keyword(s):  
Visual Acuity ◽  
Clinical Study ◽  
Contrast Sensitivity ◽  
Early Stage ◽  
Senile Cataract ◽  
Eye Drops ◽  
Vitex Negundo ◽  
Nuclear Cataract ◽  
Age Related

Purpose: Age-related cataract is one of the leading causes of blindness and avoidable visual impairment in the world. There is no time-tested, FDA-approved, or clinically proven medical treatment exists till date to delay, prevent, or reverse the progression of senile cataract. Nirgundi (Vitex negundo) is a Chakshushya single drug mentioned in Ayurvedic classics. Various animal experimental study and invitro studies in recent years using flavonoids extracted from leaves of Vitex negundo on selenite induced cataract models proved to be beneficial in arresting the progression of cataract. Hence a clinical study with Vitex negundo eye drops in the form of Arka was planned with primary objective to assess the effect of Nirgundi patra arka as Aschotana (eye drops) in pre senile cataract. Methods: The study design was interventional pre and post evaluation without control. Patients were advised to instill Nirgundi patra arka two drops thrice daily i.e. 6 am, 12 pm and 6pm for a period of 6months. Log mar visual acuity score and contrast sensitivity score were recorded before treatment, 3rd month of treatment, after treatment, 9th month (1st follow up) and 12th month (2nd follow up). Slit lamp photographs were recorded before treatment and 12th month. Study and follow up were done in 31 eyes. Result: The intervention is statistically significant while considering visual acuity and contrast sensitivity. All the 27 cases of nuclear cataract responded to the intervention, while only 83.3% of posterior sub capsular cataract and 60% of cortical cataract showed response. But the change was not significant statistically. Conclusion: The intervention was effective in improving visual acuity and contrast sensitivity in all types of pre senile cataract. Clinical assessment revealed the study was effective in preventing the progression of pathogenesis in early stage of nuclear cataract.

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