Severe amblyopia is classified based on which VA range?

Severe amblyopia is classified based on which VA range?

• A. 20/100 to 20/400
• B. 20/20 to 20/60
• C. 20/40 to 20/100
• D. 20/80 to 20/160

Answer: (A)

The level of visual acuity in the affected eye after correction tells you how severe the amblyopia is. When the amblyopic eye reads at about 20/100 up to 20/400, that indicates a substantial loss of vision, which is categorized as severe amblyopia. At 20/100, the patient sees much worse detail than normal for distance, and at 20/400 the detail that a person with normal vision could see at 400 feet is only clear at 20 feet, showing a deep reduction in acuity. This range is used clinically to distinguish severe amblyopia from milder forms and to inform treatment intensity and prognosis. Values better than 20/100 imply less severe impairment, while vision worse than 20/400 would indicate an even more profound deficit.

The level of visual acuity in the affected eye after correction tells you how severe the amblyopia is. When the amblyopic eye reads at about 20/100 up to 20/400, that indicates a substantial loss of vision, which is categorized as severe amblyopia. At 20/100, the patient sees much worse detail than normal for distance, and at 20/400 the detail that a person with normal vision could see at 400 feet is only clear at 20 feet, showing a deep reduction in acuity. This range is used clinically to distinguish severe amblyopia from milder forms and to inform treatment intensity and prognosis. Values better than 20/100 imply less severe impairment, while vision worse than 20/400 would indicate an even more profound deficit.