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Lea Gratings Paddles
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).…
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Description
| 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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