WalterWu_2025_AgingEyeSummit_250812.pdf

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1、Connecting Visual Acuity with Daily Viewing Experience in Individuals with Low VisionWalter Wu,PhDOSU College of OptometryVisual AcuityVisual Acuity(VA)is a widely used way measuring a persons ability to see small details(often assessed by letter acuity charts).Visual Acuity is often expressed in Sn

2、ellen unit in the US:20/20 or better:Normal Vision 20/40 or worse:Low Vision 20/200 or worse:Legal BlindnessHowever,the acuity numbers does not tell us what a person can do or cant do in their daily life.Visual Acuity Survey 100 Yes/No Questions.Each question(item)includes a familiar object viewed a

3、t a given viewing distance.Q.When sitting directly across the dinner table from a friend,would you be able to see if they have buttons on their shirt?(about 1.6 degree)Good Visual AcuityWorse Visual AcuityQ.Are you able to see any texture on the surface of the moon on a clear dark night?(about 0.5 d

4、eg)Q.When you are looking at a chess board sitting on the table in front of you,are you able to see the individual squares on the board?(about 6.7 degree)Q.If you are looking at an open carton of eggs on the table in front of you,would you be able to count the individual eggs?(about 5 degree)Q.When

5、walking down a sidewalk,are you able to see the outline of the sidewalk path if it is bordered by green grass?Results 385 Participants with VA ranging from-0.3 logMAR(20/10)to 2 logMAR(20/2000).Age between 18 and 93(40%older than 65;average:55.7).Participant A gave 80/100 yeses vs Participant B gave

6、 80/100 yeses.Vision Ability Hard vs.easy:Longer distances/smaller targets are harder questions;shorter/bigger are easier.How we score it:We use a standard method called Item Response Theory(IRT).Think of it as a smart ruler that learns how hard each question is and estimates each persons vision abi