Significant Improvement in Dynamic Visual Acuity after Cataract Surgery: A Promising Potential Parameter for Functional Vision

Abstract

PurposeDynamic visual acuity (DVA) is a relatively independent parameter for evaluating the ability to distinguish details of a moving target. The present study has been designed to discuss the extent to which age-related cataract impacts DVA in elderly individuals and to determine whether it could be restored after bilateral phacoemulsification combined with intraocular lens implantation surgery.MethodsTwenty-six elderly cataract patients scheduled for binocular cataract surgery and 30 elderly volunteers without cataract were enrolled in the study. DVA at 15, 30, 60 and 90 degree per second (dps) was assessed, and velocity-dependent visual acuity decreases between consecutive speed levels were calculated.ResultsCompared with the control group, the patient group exhibited significantly worse DVA performance at all speed levels (p<0.001), and the decreases in velocity-dependent visual acuity were more serious in the patient group at the intervals of 0–15 dps (p<0.001), 15–30 dps (p = 0.007) and 30–60 dps (p = 0.008). Postoperatively, DVA performance at every speed level in the patient group clearly improved (p<0.001) and recovered to levels compatible to the control group. The decrease in visual acuity with increasing speed was less pronounced than during the preoperative phase (p0–15 dps = 0.001, p15–30 dps<0.001 and p30–60 dps = 0.001) and became similar to that of the control group. The postoperative visual benefit regarding DVA was more pronounced than the improvement in static visual acuity (p15 dps = 0.001 and p<0.001 at 30 dps, 60 dps and 90 dps).ConclusionsThe impact of age-related cataract on DVA was more severe than its effects on static visual acuity. After cataract surgery, not only static vision of the patients was restored markedly, but also the dynamic vision. DVA could be an important adjunct to the current evaluation system of functional vision, thereby meriting additional attention in clinical assessment.

Preliminary evaluation of the VIsion PERformance (VIPER) simulator

“…The clinical tests in this study show that the study population was within a normal range when reviewing the corrected distance visual acuity, contrast sensitivity and aberrometry results [31,32]. Additionally, the age range of the study population was selected to limit age-related contrast sensitivity decline [14,15]. Higher-order aberrations (HOAs) measured in this cohort are consistent with measurements in normal myopic eyes, but it should be noted that HOAs can positively or negatively affect visual performance [33][34][35].…”

“…Thirty active duty U.S. military personnel aged 25-35 years old with the best corrected distance VA of 20/20 (logMAR 0.00) or better in both eyes were randomized into the study. This range was selected to minimize the effect of the reported decline in the contrast sensitivity (CS) and VA as a function of age [4,14,15]. Such a decrease can degrade task performance [15].…”

“…This range was selected to minimize the effect of the reported decline in the contrast sensitivity (CS) and VA as a function of age [4,14,15]. Such a decrease can degrade task performance [15]. The participants were required to detect and identify road signs and mock improvised explosive devices (IEDs) in separate tests, under either daytime conditions or with infrared imagery on the VIPER system, with and without correction.…”

Statinis ir dinaminis regos aštrumas

“…Po kataraktos operacijos DRA vertinimas pagerėjo kiekviename greičio lygyje ir susilygino su kontrolinės grupės rezultatais. Tyrimo rezultatai rodo, kad dinaminis regėjimo aštrumas galėtų būti svarbus funkcinio regėjimo tyrimams klinikinėje praktikoje [33]. 2006 m. Nakatsuka palygino tiramųjų dinaminio regėjimo aštrumo rezultatus esant refrakcijos korekcijai ir be refrakcijos korekcijos [34].…”

Investigation of MicroRNA Expression in Anterior Lens Capsules of Senile Cataract Patients and MicroRNA Differences According to the Cataract Type

“…Cataract, defined as the clouding of natural crystalline lens in the eye, is the most common cause of blindness worldwide and accounts for nearly 42% of all causes of blindness. 1 , 2 Multiple factors, such as aging, eye injury, diabetes mellitus, ultraviolet exposure, drug use, and other ocular diseases increase the risk for cataract. 3 – 5 However, the most common cause is aging.…”