| Sr No |
Topic |
Discription |
| 1 |
Catagory |
Pediatric Opthalmology |
| 2 |
Material |
While I couldn’t find a very detailed material composition (e.g. exact paper stock, lamination), these charts are generally printed on durable, foldable board / heavy cardstock / laminated material so they survive repeated use. |
| 3 |
Test Distance |
Recommended for use at 10 feet (≈3 meters). |
| 4 |
Dimensions |
Unfolded size: approx 17″ × 21″ (≈ 43 cm × 53.4 cm), Folded: about 17″ × 10.5″ (≈ 43 cm × 26.7 cm), Foldable for easy transport / storage |
| 5 |
How to use for |
Detects visual acuity in infants, children, and non-verbal |
| 6 |
Logarithmic / Proportional Spacing & Size Range |
The lines are proportionally spaced in logMAR / ETDRS format., Line sizes range from 20/200 (6/60) for the largest (top) line to 20/8 (6/2.4) for the smallest (bottom), On the reverse side (Massachusetts Visual Acuity Format) it has a “50% spaced rectangle” version with line sizes from about 20/100 to 20/8 (6/30 to 6/2.4) equivalent. |
| 7 |
Purpose |
Designed for screening or testing distance visual acuity in young children (starting age about 2½ to 3 years, Useful in vision therapy, pediatrics, schools, or clinics to assess recognition acuity, amblyopia detection, monitoring progress |
| 8 |
Durability |
While I couldn’t find a very detailed material composition (e.g. exact paper stock, lamination), these charts are generally printed on durable, foldable board / heavy cardstock / laminated material so they survive repeated use., The foldable design reduces wear during storage / transport |
| 9 |
Unique Selling Proposition (USP) |
Works without verbal responses, portable, clear contras |
| 10 |
Number of Paddles |
Four paddles total: three with stripes of different widths/densities, one with a uniform grey surfac |
| 11 |
Acuity Level |
Six stripe sizes: 0.25–8.0 cycles/cm. |
| 12 |
Set |
4 paddles (3 striped, 1 solid grey |
| 13 |
Size |
About 8 inches (20 cm) diamete |
| 14 |
Handle |
Easy-to-hold for quick testing. |
| 15 |
Limitations |
Measures detection (not recognition) acuity; needs proper setup and lighting |
| 16 |
Limitations / Practical Considerations |
Requires adequate ambient lighting and correct setup (vertical, mounted at eye level) for accurate readings. (Standard for any acuity chart.) (From clinical manuals),Younger children (under ~30 months) may have lower cooperation, so results might be less reliable or require additional encouragement |
| 17 |
Accuracy & Standards |
The proportional spacing (ETDRS/logMAR) means consistent scaling of visual acuity steps. This gives more precise measurement than some older non-log spaced charts., It has been validated in research: e.g. studies comparing Lea symbols vs Landolt C, showing good applicability in young children and good sensitivity for amblyopia |
| 18 |
Included Accessories / Supporting Materials |
Includes response key and instructions, Some versions include flash cards |
| 19 |
Mounting / Display Features |
Has a hole for hanging on a wall |
| 20 |
Optotype Design (LEA Symbols) |
Consists of four symbols: a house, an apple, a circle, and a square. The symbols are “crowded” (i.e. surrounded by other symbols / adjacent symbols) to make the test more sensitive (especially for amblyopia). |
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