LOW VISION (Visus Subnormal)

Faktor untuk visus baik/normal

1. Jalur visual : - Media Refrakta- Reseptor dan saraf di retina- Aferen dan eferen kepusat dan dari pusat - Organ Refraksi

2. Bebas penyakit :- Radang - Trauma- Infeksi - Degenerasi- Merediter - Sistemik- Tumor dan keganasan

3. Pacuan yang adekwat- Low vision / visual imperment - Bisa dikoreksi- Low vision aid

Blindness :- Prevention- Early management- Cane stick staining

CLASSIFICATION OF LOW VISION

Range of 20/12 Normal reading performmance  

Regular bifocal up to 3 D 

Normal 16 Normal reading distance

Vision 20/20

  25    

Near Normal 20/30 Normal performanceStronger bifocal 4 - 5 D

vision 40 using shoter

50 reading distanceLow power magnifier (5 D)

60

Moderate 20/80 Near normal  

Low 100 Performance with eye glasses (6-10 D)

Vision 125 Magnifiers

  160      

Severe Low 20/200 Slower than normal

Counting fingers 10 ft

Cant not be binocular

Vision 250 With aids High-power reading lens (12-20 D)

300 (legal blindess, USA) High power stand magnifier

400

Profound 20/500 Limited reading  Counting fingers 5 ft

 

Low Vision 600 With aids

  800 Mobility problem  

Near normal 20/1000Braille

Blindness 1500 Counting fingers 2 ft

2000 Cane staining

Total No light No vision  Cane staining

 Blindness Preception