# 📐 L2 Spec — Diabetic Retinopathy Grading from Fundus Imaging (PWDR) — Spec Skeleton
**ID:** `L2-513-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-513`](/artifact/l1/L1-513)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553390
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 8192 |
| W | px | 512 – 8192 |
| Snr db | dB | [NEEDS_HAND_AUTHORING: bounds] |
| Image quality | — | 0.0 – 0.5 |
| Media opacity | — | 0.0 – 0.4 |
| Pixel resolution um | µm | [NEEDS_HAND_AUTHORING: bounds] |
| Pupil dilation state | — | [NEEDS_HAND_AUTHORING: bounds] |
| Field of view degrees | — | 30 – 200 |
| Peripheral field truncation | — | [NEEDS_HAND_AUTHORING: bounds] |
| Grader inter rater variability calibration | — | [NEEDS_HAND_AUTHORING: bounds] |
| Manual vs automated lesion segmentation disagreement | — | [NEEDS_HAND_AUTHORING: bounds] |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.85_accuracy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`70816eb0ae506e87d4931a9da835e048f2673dcdd8411666484c330872845434`
## 5. On-chain Registration
- **Chain hash:** `0x93236fbd2c9735b790316b146b25588a0c1faa8bd26caad78f9b60dfc9eeb6ba`
- **Chain tx hash:** `0x5f2d80dfa4ebcc438c62fd499ecd7efb822e3cdc865dd713dc5d371e0c017dab`
- **Chain block:** `41553390`
---
## File Mapping
This bundle consists of: `L2-513-001.md`, `L2-513-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-513-001.md` | Source of truth — edit this | Human or LLM |
| `L2-513-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-513-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._