Crystal's MCW Coder Hub👁️ ICD-10 CM H02.055 — Trichiasis Without Entropion, Left Lower Eyelid
Billable Code — No Warning Needed
ICD-10 CM H02.055 is a valid, billable, fully specified 6-character ICD-10-CM code for FY2026. All six characters are present and meaningful:
H02(other disorders of eyelid) +.05(trichiasis without entropion) +5(left lower eyelid). This code specifically designates misdirected lashes of the left lower eyelid only, with the lid margin itself confirmed to be in a normal anatomic position — the essential qualifier separating this code from the entropion family.
Non-Billable Parent Codes
- ❌
H02.05— 5-character header — missing laterality and lid specificity- ❌
H02.0— 4-character header — non-billable, no specificity- ❌
H02.056— left eye, unspecified eyelid — do not use when documentation clearly states left lower lid Always submit H02.055 (all 6 characters) when left lower eyelid trichiasis is documented.
Left Eye = -LT Modifier and -E2 for Per-Lid Payers
Every CPT code billed for the left eye should carry the -LT modifier. When billing per eyelid, use -E2 (lower left eyelid). Getting the laterality modifier wrong on 67820 or 67825 can cause claim denial — or worse, a mismatch between diagnosis (H02.055 = left) and procedure modifier (-RT = right). Always double-check that your diagnosis laterality and procedure modifier are pointing to the same eye.
🔍 Code Description
ICD-10-CM H02.055 classifies trichiasis of the left lower eyelid occurring without concurrent entropion — one or more lower eyelashes of the left eye are growing inward toward the corneal or conjunctival surface while the left lower eyelid margin remains in its normal anatomical position. The misdirected lash(es) mechanically abrade the inferior cornea and inferior bulbar conjunctiva with each blink, generating a repeating cycle of epithelial microtrauma, reflex tearing, inflammatory response, and risk of corneal ulceration if left untreated.
ICD-10 CM H02.055 is the direct left-eye mirror of H02.052 (right lower eyelid). The clinical picture, diagnostic criteria, treatment options, and coding logic are identical — the sole distinction is laterality. All guidance in this note applies equally to H02.052 with the substitution of right-eye modifiers (-RT, -E4). When reviewing the chart, always confirm whether the fellow right lower lid (H02.052) is also affected, as bilateral lower lid trichiasis is common — especially in patients with cicatricial conditions — and must be captured with both codes.
🌳 Code Tree / Hierarchy
H02.0 Entropion and trichiasis of eyelid ❌ Non-billable header
│
└── H02.05 Trichiasis without entropion ❌ Non-billable header
│
├── H02.051 Right upper eyelid ✅ Billable
├── H02.052 Right lower eyelid ✅ Billable
├── H02.053 Right eye, unspecified eyelid ✅ (only if lid not documented)
├── H02.054 Left upper eyelid ✅ Billable
├── H02.055 Left lower eyelid ◀ THIS CODE ✅
├── H02.056 Left eye, unspecified eyelid ✅ (only if lid not documented)
└── H02.059 Unspecified eye, unspecified eyelid ⚠️ Last resort only
H02.055 vs. Adjacent Laterality and Lid Codes
| Code | Eye | Lid | Clinical Use | Billable? |
|---|---|---|---|---|
| H02.051 | Right | Upper | Right upper lash abrades superior cornea | ✅ |
| H02.052 | Right | Lower | Right lower lash abrades inferior cornea | ✅ |
| H02.053 | Right | Unspecified | Only if documentation omits upper vs. lower | ✅ |
| H02.054 | Left | Upper | Left upper lash abrades superior cornea | ✅ |
| H02.055 | Left | Lower | Left lower lash abrades inferior cornea ← This Code | ✅ |
| H02.056 | Left | Unspecified | Only if documentation omits upper vs. lower | ✅ |
| H02.059 | Unspecified | Unspecified | Documentation deficiency — query first | ✅ ⚠️ |
When Both Left Eyelids Are Affected — Two Codes
If documentation describes trichiasis of both the left upper and left lower eyelid, assign H02.054 and H02.055 together. There is no combined “left eye, both lids” code — each lid gets its own code. This also applies when all four lids are affected (common in OCP, SJS, trachoma): assign H02.051 + H02.052 + H02.054 + H02.055 together. Under-coding a multi-lid presentation is one of the most common trichiasis documentation completeness failures.
📋 Clinical Overview
Why the Lower Eyelid Is Mechanically Distinct
The lower eyelid lacks the structural firmness of the upper lid — its tarsal plate is shorter and thinner, and its retractor system (capsulopalpebral fascia + inferior tarsal muscle) provides less positional rigidity. This makes the lower lid more susceptible to the influences of horizontal lid laxity, cicatricial conjunctival scarring, and involutional tissue changes — all of which predispose to lash follicle misdirection without requiring the full inversion of entropion.
| Anatomic Feature | Relevance to H02.055 |
|---|---|
| Thin inferior tarsal plate | Less structural resistance to cicatricial deformation → follicle misdirection |
| Capsulopalpebral fascia | Involutional disinsertion can allow lid movement that misdirects lashes |
| Inferior cornea | Contact zone — inferior SPK/PEE on fluorescein is the clinical signature |
| Left inferior punctum | Epiphora may be compounded if punctal malposition coexists in same lower lid |
| Gray line (mucocutaneous junction) | Surgical landmark for lid-splitting procedures — anterior vs. posterior lamella |
Symptoms — Left Lower Eyelid Trichiasis
| Symptom | Mechanism | Documentation Clue to Look For |
|---|---|---|
| Foreign body sensation | Lash tip contacting cornea/conjunctiva with every blink | ”Feels like something in my left eye” |
| Epiphora (tearing) | Reflex lacrimation from epithelial irritation | ”Tearing left eye” |
| Photophobia | Corneal epithelial disruption lowers light pain threshold | ”Light sensitivity left eye” |
| Inferior conjunctival injection | Mechanical irritation from lash contact with inferior bulbar conjunctiva | ”Redness left eye, inferior” |
| Inferior corneal staining | Punctate epithelial erosions at inferior 1/3 cornea | ”SPK inferior 1/3 OS” — classic lower lid signature |
| Corneal abrasion | Prolonged or acute lash contact → epithelial defect | ”Corneal abrasion OS” — separately codeable as H16.012 |
| Reflex blepharospasm | Orbicularis spasm from pain/irritation | ”Twitching / squinting left eye” |
| Mucous discharge | Goblet cell irritation → mucinous tearing | ”Mucous discharge left eye” |
| Blurred vision | Tear film disruption from chronic irritation; corneal scarring in late cases | ”Blurry vision OS” |
Inferior SPK on Fluorescein = Lower Lid Source
When you see documentation like “inferior SPK grade 2, OS” or “inferior corneal staining OS on fluorescein” in an ophthalmology note, that staining distribution points to the lower eyelid as the lash source — and supports H02.055 over H02.054 (upper lid). Superior SPK points to the upper lid (H02.054). If both inferior and superior SPK are documented, check whether both lids have misdirected lashes.
Etiology — Common Causes of Left Lower Eyelid Trichiasis
| Etiology | Notes | Documentation Flag |
|---|---|---|
| Idiopathic / involutional | Isolated follicle misdirection — older adults; most common cause | ”Misdirected lash(es) left lower lid, no specific etiology” |
| Chronic blepharitis | Lid margin inflammation → follicular scarring → misdirection | ”Chronic blepharitis OS,” “posterior lid margin disease” |
| Ocular cicatricial pemphigoid (OCP) | Subconjunctival fibrosis → progressive cicatricial trichiasis all lids | ”OCP,” “mucous membrane pemphigoid” — staged, progressive bilateral |
| Stevens-Johnson syndrome (SJS) | Acute mucosal sloughing → chronic conjunctival scarring → cicatricial trichiasis | ”SJS sequelae,” “conjunctival scarring OS” |
| Trachoma | Chlamydia trachomatis — cicatricial disease, leading infectious cause globally | ”Trachoma” → dual code A71.x + H02.055 |
| Post-traumatic / chemical burn | Eyelid laceration scar or chemical injury → distorted follicle growth | ”Post-traumatic,” “chemical burn eyelid” |
| Post-surgical | Prior blepharoplasty, ectropion repair, entropion repair → suture scarring | ”Post-blepharoplasty trichiasis OS” |
| Horizontal lid laxity | Age-related lower lid redundancy — tissue excess creates conditions for misdirection | ”Lower lid laxity,” snap-back test positive |
| Eyelid margin malignancy | Trichiasis can be the presenting sign of an undiagnosed lid margin tumor | ⚠️ Query if unexplained focal trichiasis — new or rapidly progressing |
| Epiblepharon | Congenital — Excludes1 applies at H02 (Q10.3x family only — NOT H02.055) | “Epiblepharon” = Q10.3x |
Eyelid Margin Malignancy — Don't Miss It
Per EyeWiki AAO, trichiasis can be a presenting sign of eyelid margin malignancy — particularly sebaceous carcinoma or basal cell carcinoma of the lid margin. If documentation notes focal, isolated, treatment-resistant trichiasis at a single zone of the lower lid — especially with loss of lashes in an adjacent area (madarosis), poliosis, or a visible lid margin lesion — this is a red flag worth noting in clinical documentation review. If a biopsy or malignancy workup is initiated at the same encounter, code the neoplasm workup codes alongside H02.055.
🔬 Diagnostic Documentation — What Supports H02.055
Slit Lamp Exam Findings
| Finding | Significance for Coding |
|---|---|
| Left lower lid margin in normal position | Confirms “without entropion” qualifier — this is the key distinguishing finding |
| Lash(es) touching cornea or conjunctiva OS | Core finding — “lash on cornea OS,” “misdirected lash left lower lid” |
| Inferior SPK / PEE on fluorescein OS | Corneal evidence of lower lid lash contact — inferiorly distributed |
| Normal lid snap-back / distraction test | Confirms absence of significant laxity/ectropion |
| Absence of lid inversion on downgaze | Rules out intermittent entropion on lower lid |
| Follicle misdirection visible on slit lamp | Lash growing posteriorly from normal-position margin |
"Trichiasis Left Eye" Without Lid Specification — Query Before Coding
If the ophthalmologist documents only “trichiasis left eye” without specifying upper vs. lower lid, do not default to H02.055 or H02.056. As a CIC-trained coder, you know specificity is non-negotiable. Query the physician for the affected lid(s) before assigning a code. H02.056 (left eye, unspecified) exists only as a last resort when a query is not possible or a response is not obtained.
🛠️ CPT / HCPCS — Treatment Procedures for H02.055
Epilation Codes — Left Lower Eyelid
| CPT | Description | Modifier(s) | When to Use |
|---|---|---|---|
| 67820 | Correction of trichiasis; epilation by forceps only | -LT (left eye); -E2 (left lower lid — per-lid payers) | Mechanical forceps removal — most common first-line office treatment |
| 67825 | Correction of trichiasis; epilation by other than forceps (electrosurgery, cryotherapy, argon/diode laser, radiofrequency) | -LT (left eye); -E2 (left lower lid — per-lid payers) | When lash follicle ablation or destruction is performed to reduce recurrence |
Modifier Strategy — Three Payer Methods
Always Confirm Your MAC/Payer's Billing Method Before Finalizing Modifiers
Per AAPC Ophthalmology Coding Alert, payers reimburse epilation codes using one of three methods. The wrong modifier = claim denial or underpayment:
Payer Method Billing Approach Modifier for Left Lower Lid Per eye One unit per eye treated -LT (left); -RT (right); -50 (bilateral same session) Per eyelid One unit per eyelid treated -E2 (left lower); -E1 (left upper); -E4 (right lower); -E3 (right upper) Per lash One unit per lash removed Rare — verify with payer before billing Note: CPT 67820 has a multiple-procedure indicator of “2” — standard payment adjustment rules apply for multiple procedures. Use modifier -51 on the second procedure line when treating multiple lids at the same session.
Bilateral Lower Lid Same-Session Epilation
When both lower eyelids are treated at the same visit (H02.055 left lower + H02.052 right lower):
| Line | CPT | Modifier | Diagnosis |
|---|---|---|---|
| 1 | 67820 | -RT or -E4 | H02.052 (right lower) |
| 2 | 67820 | -51 -LT or -51 -E2 | H02.055 (left lower) |
For per-eye payers billing bilaterally, use 67820-50 on one line — but confirm your MAC’s preference.
Evaluation and Management — Trichiasis Encounter Codes
| CPT | Description | When to Use |
|---|---|---|
| 92004 | Comprehensive ophthalmologic exam — new patient | New patient presenting with left lower eyelid trichiasis |
| 92014 | Comprehensive ophthalmologic exam — established patient | Follow-up trichiasis management; epilation visit |
| 92012 | Intermediate ophthalmologic exam — established patient | Brief lash status check only |
Exam + Epilation on the Same Date — Both Are Billable
An ophthalmologic exam code (92012, 92014) and an epilation code (67820, 67825) are both billable on the same date of service — the exam is a separately identifiable evaluation from the procedure. No modifier -25 is required on ophthalmologic exam codes (unlike office E/M), though some commercial payers may request it anyway. Verify your payer’s specific policy.
💊 Coding Scenarios
Scenario 1 — Routine Forceps Epilation, Left Lower Eyelid (Outpatient)
Clinical Vignette: A 74-year-old female, established patient, presents for follow-up of known trichiasis, left lower eyelid. Slit lamp: two misdirected lashes, left lower eyelid, contacting inferior corneal surface — inferior SPK grade 1-2 OS on fluorescein. Lower lid margin in normal position. Epilation by forceps performed — two lashes removed, left lower eyelid.
CPT / HCPCS:
- 92014 — Comprehensive ophthalmologic exam, established patient
- 67820-LT (or -E2 per-lid payers) — Epilation by forceps, left lower eyelid
ICD-10-CM:
- H02.055 — Trichiasis without entropion, left lower eyelid
Scenario 2 — Cryotherapy Epilation Left Lower Eyelid + Corneal Abrasion (Outpatient)
Clinical Vignette: A 61-year-old male presents with acute left eye pain, tearing, and photophobia × 2 days. Slit lamp: three misdirected lashes, left lower eyelid — one causing a 3mm linear inferior corneal abrasion confirmed with fluorescein (NaFl 2+, inferior cornea OS). Left lower lid margin in normal position. Cryotherapy epilation performed under topical anesthesia — three lashes, left lower eyelid.
CPT / HCPCS:
- 92014 — Comprehensive ophthalmologic exam, established patient
- 67825-LT (or -E2) — Epilation by cryotherapy, left lower eyelid
ICD-10-CM:
- H02.055 — Trichiasis without entropion, left lower eyelid (primary etiology driving the abrasion)
- H16.012 — Corneal abrasion, left eye (acute epithelial defect — documented, separately codeable)
Sequence H02.055 First — It's the Cause
The trichiasis is the underlying cause of the corneal abrasion. Sequence H02.055 as the primary diagnosis when the abrasion is a direct consequence of the lash contact. The corneal abrasion (H16.012) is the acute complication that also affects care — antibiotic drops, lubricants, possible patching — so it warrants its own code. Both conditions coexist on the claim and neither absorbs the other.
Scenario 3 — Bilateral Lower Lid Trichiasis, Both Lower Lids Treated Same Session (Outpatient)
Clinical Vignette: A 67-year-old female with history of chronic blepharitis. Slit lamp: multiple misdirected lashes, right lower and left lower eyelids — inferior SPK bilateral on fluorescein. Both lower lid margins in normal position. Physician performs epilation by forceps, bilateral lower eyelids, same session.
CPT / HCPCS:
- 67820-RT (or -E4) — Epilation by forceps, right lower eyelid
- 67820-51-LT (or -51-E2) — Epilation by forceps, left lower eyelid (modifier -51 — multiple procedures)
- 92014 — Comprehensive ophthalmologic exam, established patient
ICD-10-CM:
- H02.052 — Trichiasis without entropion, right lower eyelid
- H02.055 — Trichiasis without entropion, left lower eyelid
Scenario 4 — All Four Lids Affected, Cicatricial Disease (Outpatient)
Clinical Vignette: A 55-year-old male with known ocular cicatricial pemphigoid (OCP). Slit lamp: recurrent misdirected lashes present on all four eyelids — superior and inferior SPK bilateral on fluorescein. All four lid margins in normal anatomic position. Argon laser epilation performed on all four eyelids, same session.
CPT / HCPCS:
- 67825-E3 — Laser epilation, right upper eyelid
- 67825-51-E4 — Laser epilation, right lower eyelid
- 67825-51-E1 — Laser epilation, left upper eyelid
- 67825-51-E2 — Laser epilation, left lower eyelid
- 92014 — Comprehensive ophthalmologic exam, established patient
ICD-10-CM:
- H02.051 — Trichiasis without entropion, right upper eyelid
- H02.052 — Trichiasis without entropion, right lower eyelid
- H02.054 — Trichiasis without entropion, left upper eyelid
- H02.055 — trichiasis without entropion, left lower eyelid
- (OCP code — H10.811 or appropriate ocular pemphigoid code per documentation — if separately documented and supported)
Four Diagnosis Codes for Four Lids — Required and Correct
There is no single ICD-10-CM code for “trichiasis all four eyelids.” Each affected eyelid has its own code in the H02.05x family. Assigning all four codes is correct, necessary, and reflects the full clinical picture. This completeness matters especially in cicatricial disease patients — OCP, SJS, trachoma — who are high-frequency, high-complexity patients where every coded comorbidity supports medical necessity and risk scoring.
Scenario 5 — Left Lower Eyelid Trichiasis as Additional Diagnosis, Inpatient Admission
Clinical Vignette: A 71-year-old female admitted for vitreoretinal surgery, left eye (H33.002 — retinal detachment, left eye). H&P documents: “Known trichiasis left lower eyelid — managed with periodic epilation by outpatient ophthalmologist — no in-hospital intervention planned for trichiasis this admission.”
Principal Diagnosis:
- H33.002 — Unspecified retinal detachment with rhegmatogenous detachment, left eye (principal — reason for admission)
Additional Diagnoses:
- H02.055 — Trichiasis without entropion, left lower eyelid (documented active condition, actively managed — meets UHDDS criteria)
UHDDS Reasoning — Does H02.055 Qualify Here?
A condition qualifies as a reportable UHDDS additional diagnosis if it requires clinical evaluation, therapeutic treatment, diagnostic procedures, extends LOS, or increases nursing care/monitoring during the admission. Trichiasis being managed by periodic epilation and documented in the H&P meets the “therapeutic treatment” criterion even when that treatment is outpatient-based — the physician is actively managing it. As a CIC, your judgment call is whether the documentation is specific enough to support inclusion. If the H&P just says “trichiasis” with no management statement, a query is appropriate.
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Never assign H02.055 when left lower entropion is present — inverted left lower lid = H02.002/H02.012/H02.022/H02.032; H02.055 is explicitly “without entropion” |
| ❌ | Never default to H02.056 (left eye, unspecified) when documentation states lower lid — always code to highest specificity when documented |
| ❌ | Never omit -LT or -E2 modifier on 67820/67825 for left lower lid — laterality mismatch between diagnosis (left) and modifier (right) = claim denial and audit risk |
| ❌ | Never use H02.055 for congenital trichiasis/epiblepharon — Excludes1 at H02 prohibits use with Q10.0-Q10.3 |
| ❌ | Never code just one lid when documentation describes multiple lids — capture every documented lid with its own code |
| ✅ | Match your modifiers to your diagnosis — H02.055 (left) must pair with -LT or -E2 on the procedure line; never -RT or -E3 |
| ✅ | Check inferior corneal staining location — inferior SPK OS = left lower lid source supporting H02.055; superior SPK OS = left upper lid source (H02.054) |
| ✅ | Check the fellow right lower lid — bilateral lower lid trichiasis is common; if H02.052 also applies, assign both |
| ✅ | Code corneal abrasion separately — H16.012 (left eye) when a misdirected lash causes a documented epithelial defect |
| ✅ | Code dry eye separately — H04.122 (dry eye, left lacrimal gland) when co-existing dry eye is documented; the two conditions frequently coexist and compound each other |
| ✅ | Cicatricial trichiasis patients (OCP, SJS, trachoma) — consider etiology code alongside H02.055 when the underlying condition is documented |
| ✅ | Eyelid margin malignancy watch — unexplained focal treatment-resistant trichiasis with adjacent madarosis warrants clinical documentation review |
| ✅ | The treatment CPT is your fastest clue — physician billing 67820 or 67825 with -LT = you’re in the H02.054/H02.055/H02.056 code range |
🔗 Related ICD-10-CM Codes
H02.05x — Complete Trichiasis Without Entropion Family
| Code | Description | Billable? |
|---|---|---|
| H02.05 | Trichiasis without entropion (header) | ❌ Non-billable |
| H02.051 | Right upper eyelid | ✅ |
| H02.052 | Right lower eyelid | ✅ |
| H02.053 | Right eye, unspecified eyelid | ✅ (only if lid not documented) |
| H02.054 | Left upper eyelid | ✅ |
| H02.055 | Left lower eyelid ← This Code | ✅ |
| H02.056 | Left eye, unspecified eyelid | ✅ (only if lid not documented) |
| H02.059 | Unspecified eye, unspecified eyelid ⚠️ | ✅ (last resort) |
Left Lower Eyelid Disorders — Differential Coding Reference
| Code | Description | Key Distinguishing Feature |
|---|---|---|
| H02.055 | Trichiasis w/o entropion, left lower ← This code | Normal lid margin position; lashes misdirected |
| H02.002 | Unspecified entropion, left lower eyelid | Lid margin inverted — unspecified type |
| H02.012 | Cicatricial entropion, left lower eyelid | Lid inversion from scarring |
| H02.022 | Mechanical entropion, left lower eyelid | Lid inversion from mechanical cause |
| H02.032 | Senile entropion, left lower eyelid | Age-related lid inversion |
| H02.102 | Unspecified ectropion, left lower eyelid | Lid margin everted outward |
| H02.112 | Cicatricial ectropion, left lower eyelid | Outward eversion from cicatricial scarring |
| H02.132 | Senile ectropion, left lower eyelid | Age-related lid eversion |
Concurrent / Comorbid Codes — Co-Code When Documented
| Code | Description | Co-Code When |
|---|---|---|
| H16.012 | Corneal abrasion, left eye | Documented epithelial defect from misdirected lash |
| H16.142 | Punctate keratitis, left eye | Inferior SPK documented on fluorescein OS |
| H04.122 | Dry eye syndrome, left lacrimal gland | Co-existing dry eye documented left eye |
| H10.812 | Conjunctivitis, left eye (other) | Documented conjunctival inflammation from lash irritation |
| H02.054 | Trichiasis w/o entropion, left upper eyelid | Upper left lid also affected |
| H02.052 | Trichiasis w/o entropion, right lower eyelid | Fellow lower lid also affected (bilateral lower lid) |
| H02.051 | Trichiasis w/o entropion, right upper eyelid | Right upper lid also affected (four-lid presentation) |
| A71.9 | Trachoma, unspecified | Trachoma documented as etiology of cicatricial trichiasis |
📚 Sources
1. AAPC Codify. “ICD-10 Code H02.055 — Trichiasis without entropion, left lower eyelid.” Valid and billable FY2026.
2. AAPC Codify. “ICD-10 Code H02.05 — Trichiasis without entropion.” Full subcategory listing H02.051-H02.059; Excludes1 for Q10.0-Q10.3 at H02 category level.
3. Unbound Medicine ICD-10-CM. “H02.055 — Trichiasis without entropion left lower eyelid.” Billable code confirmed.
4. AAPC Ophthalmology Coding Alert. “Code Epilation for Trichiasis.” CPT 67820/67825 per-eye, per-lid, per-lash billing methodologies; modifier -51 for multiple lids same session; -50/-LT/-RT/-E1-E4 modifier strategy.
5. AAPC Ophthalmology Coding Alert. “Avoid Irritation While Coding Epilation for Trichiasis.” Multiple-procedure indicator 2 on 67820/67825; eyelid modifier definitions -E1 (upper left), -E2 (lower left), -E3 (upper right), -E4 (lower right).
6. MD Clarity. “CPT Code 67820: What It Is, Modifiers, Reimbursement.” -LT/-RT/-50/-E1-E4 modifier applicability; per-eye and per-lid billing documentation.
7. PayerPrice. “CPT Code 67825 — Fee Schedule 2026.” -E2 (lower left eyelid) confirmed as common modifier for 67825.
8. EyeWiki AAO. “Trichiasis.” Clinical manifestations; slit lamp findings; malignancy as cause of focal trichiasis; treatment algorithm.
9. Merck Manual Professional Edition. “Trichiasis — Eyelid and Lacrimal Disorders.” Clinical distinction from entropion; fluorescein evaluation requirement; corneal ulceration risk in chronic untreated cases. Updated January 2026.
10. Review of Ophthalmology. “Trichiasis: Lashes Gone Astray.” Cicatricial trichiasis etiology spectrum; OCP, SJS, trachoma clinical contexts; acquired vs. congenital distinction.
11. All About Vision. “Superficial Punctate Keratitis.” SPK distribution and correlation to trichiasis source — inferior SPK = lower lid lash contact.