Eye Diseases > Retina
Retinal Tear
Evidence-based assessment and management of retinal tears. Comprehensive guide covering etiology, PVD-related pathogenesis, classification, Shafer's sign, laser retinopexy, and urgent referral protocols for optometry practice.
Fundus view showing a superior temporal horseshoe (flap) retinal tear with its characteristic U-shaped red break, lifted operculum, and adjacent subretinal fluid. Shafer's sign (tobacco dust — pigment cells in vitreous) indicates a full-thickness retinal break. The Weiss ring near the disc marks posterior vitreous detachment (PVD) — the primary precipitant of traction-related retinal tears. Lattice degeneration is shown in the adjacent periphery.
A retinal tear is a full-thickness break in the sensory retina, most commonly precipitated by posterior vitreous detachment (PVD). It is a significant ophthalmic emergency because an untreated symptomatic horseshoe tear carries approximately a 40% risk of progressing to rhegmatogenous retinal detachment (RRD) — the most common cause of preventable severe vision loss in adults.
The classic presentation is sudden onset of monocular flashes (photopsia) and/or new floaters, particularly following a symptomatic PVD. The presence of Shafer's sign (tobacco dust — pigmented RPE cells in the anterior vitreous) on slit-lamp examination is highly specific for a retinal break. Urgent dilated peripheral fundus examination with scleral indentation is mandatory.
Treatment — laser retinopexy or transconjunctival cryotherapy — creates a chorioretinal adhesion around the tear, preventing subretinal fluid access and detachment. When identified and treated promptly, the prognosis for preventing RRD is excellent (>95% success).
Most common cause
PVD-related traction
Key sign
Shafer's sign
Untreated horseshoe risk
~40% RRD
Treatment success
>95% (laser/cryo)
Retinal tears arise when vitreoretinal traction exceeds the mechanical strength of the sensory retina. Most are precipitated by PVD, with pre-existing peripheral retinal degeneration increasing vulnerability.
Posterior vitreous detachment (PVD)
The most common precipitant. During PVD, the vitreous collapses and separates from the ILM. At focal vitreoretinal adhesion sites (lattice, vessels, tufts), dynamic traction can tear the full-thickness retina. Occurs in ~65–70% of eyes presenting with acute symptomatic flashes and floaters.
Lattice degeneration
Present in ~8–10% of the general population; responsible for ~30–40% of rhegmatogenous retinal detachments. Thinned, atrophic retina within lattice patches is prone to atrophic round holes and tractional horseshoe tears at the margins during PVD.
High myopia
Axial elongation thins the peripheral retina and creates abnormal vitreoretinal adhesions. Myopes have earlier PVD and higher lattice degeneration prevalence. Risk increases progressively with axial length.
Ocular trauma
Blunt or penetrating trauma causes sudden vitreoretinal traction. Contrecoup force transmits to the vitreous base — the site of the strongest vitreoretinal adhesion — producing dialyses (circumferential peripheral breaks) at the ora serrata.
Aphakia / pseudophakia
Post-cataract surgery eyes have significantly increased risk of RRD, partly from altered vitreous dynamics and accelerated PVD. Risk is further elevated after Nd:YAG capsulotomy.
Vitreoretinal tufts
Focal congenital vitreoretinal adhesions (cystic, non-cystic, zonular) are found in ~5% of eyes. During PVD, traction on these tufts can avulse a small fragment of retina, creating an operculated tear.
Inherited vitreoretinal conditions
Stickler syndrome (type II collagen mutations) and Wagner syndrome are associated with abnormal vitreous liquefaction, giant retinal tears, and early-onset RRD. Marfan syndrome also increases risk.
Previous retinal tear or RRD
Bilateral disease in ~10–15% of cases. The fellow eye requires thorough examination and ongoing surveillance.
Retinal tear formation is driven by dynamic vitreoretinal traction at sites of focal adhesion during the process of posterior vitreous detachment.
- 1Age-related vitreous syneresis: The vitreous gel undergoes progressive liquefaction (lacunae formation) from the fourth decade onward. Condensed collagen fibrils form and the central vitreous becomes increasingly liquid while peripheral cortical vitreous remains adherent to the ILM.
- 2Posterior vitreous detachment (PVD): The liquefied vitreous suddenly shifts posteriorly, separating the posterior hyaloid from the ILM at the macula and optic disc. The Weiss ring (avulsed glial tissue from the disc margin) becomes visible ophthalmoscopically as a floating ring opacity.
- 3Focal vitreoretinal adhesion: At sites of abnormally strong vitreoretinal adhesion (lattice degeneration margins, vitreoretinal tufts, retinal vessels, areas of peripheral cystoid degeneration), the posterior hyaloid fails to separate cleanly during PVD.
- 4Dynamic traction: As the vitreous collapses anteriorly and the eye moves, anteroposterior and tangential traction forces are exerted on the adherent retina. If these forces exceed the mechanical tensile strength of the retina, a full-thickness break is created.
- 5Horseshoe (flap) tear formation: The posterior margin of the tear is avulsed while the anterior flap (operculum) remains attached to the vitreous face. The tear is U-shaped with an elevated flap and a free posterior edge.
- 6Subretinal fluid ingress: Once a full-thickness break exists, liquid vitreous can pass through the break into the potential space between the sensory retina and RPE. Progressive accumulation leads to rhegmatogenous retinal detachment (RRD) — the rate depending on break size, location, and vitreous traction.
- 7Shafer's sign (tobacco dust): RPE cells liberated through the break enter the vitreous. These pigmented cells accumulate in the anterior vitreous and are visible on slit-lamp as brown granules — a highly specific sign of a full-thickness retinal break.
| Type | Features | RRD Risk | Management |
|---|---|---|---|
| Horseshoe (flap) tear | U-shaped break; operculum still attached to vitreous face; active traction ongoing | HIGH (~40%) | Treat — laser retinopexy or cryotherapy (urgent) |
| Operculated tear | Operculum fully avulsed; free-floating in vitreous; traction relieved at break edge | LOW (~5%) | Monitor (treat if symptomatic or with subretinal fluid) |
| Atrophic round hole | No traction component; within lattice degeneration; small, round, full-thickness | VERY LOW (<1%) | Monitor; treat only if symptomatic or high-risk fellow eye |
| Retinal dialysis | Circumferential break at ora serrata; typically traumatic; slow RRD; may present late | HIGH if untreated | Treat — laser or cryotherapy; if RRD, surgery |
| Giant retinal tear (GRT) | Circumferential break ≥90°; often bilateralisation; vitreoretinal disorder | HIGH — RRD | Surgical repair — PPV + PFCL + silicone oil or gas |
Anatomical Location Classification
- Equatorial: Most common location for PVD-related horseshoe tears; along the equatorial retinal circumference
- Ora serrata (basal): Dialyses typically originate here; strongest vitreoretinal adhesion zone
- Posterior pole: Rare; macular tears require separate classification and management (vitrectomy + gas)
- Superotemporal quadrant: Most common quadrant for symptomatic tears — gravity-dependent RRD risk
Symptomatic PVD
Most important acute precipitant; symptomatic PVD with flashes/floaters carries ~15% risk of retinal break — all require urgent dilated examination
High myopia (>6D)
Axial elongation predisposes to lattice degeneration, vitreous liquefaction, and earlier PVD; risk increases with degree of myopia
Lattice degeneration
Present in ~8–10% of the population; ~30–40% of RRDs arise from lattice-related tears or holes
Previous retinal tear or RRD
10–15% bilateral RRD incidence; fellow eye requires full peripheral fundus examination with scleral indentation
Family history of RRD
Particularly relevant for heritable vitreoretinal disorders (Stickler syndrome, Wagner syndrome)
Aphakia / pseudophakia
Post-cataract surgery significantly increases RRD risk; further elevated by Nd:YAG posterior capsulotomy
Ocular or head trauma
Even mild blunt trauma can cause PVD and peripheral breaks; dialyses may present months later
Vitreoretinal surgery history
Prior PPV or scleral buckling creates iatrogenic risk of peripheral breaks and fibrous traction
Male sex
Higher overall incidence of RRD; possibly related to higher rates of myopia and trauma
Age 50–70 years
Peak incidence of symptomatic PVD and subsequent retinal breaks in the sixth and seventh decades
Shafer's sign (tobacco dust)
Pigmented RPE cells in the anterior vitreous, visible on slit-lamp at the pupillary margin using retroillumination or indirect illumination. Highly specific for a full-thickness retinal break. Presence mandates urgent dilated peripheral fundus examination even if no break is initially visible.
Horseshoe tear
U-shaped, bright red peripheral retinal break with an attached flap (operculum) pointing anteriorly toward the ora serrata. Best visualised with binocular indirect ophthalmoscopy (BIO) and scleral indentation, or with slit-lamp and a Volk high-plus lens.
Operculated tear
Round or oval break with a free-floating fragment of retina (operculum) visible in the adjacent vitreous. No flap attachment — traction is relieved, hence lower RRD risk than horseshoe tears.
Weiss ring
Annular, grey-white, glial-tissue opacity floating in the posterior vitreous just anterior to the optic disc — the avulsed glial ring from the optic disc margin during PVD. Seen on fundoscopy or slit-lamp as a free-floating ring. Confirms PVD completion.
Vitreous haemorrhage
Red blood cells dispersed in the vitreous, causing diffuse haziness or discrete clumps. Occurs when the tear involves a retinal blood vessel. Mild haemorrhage appears as settled inferiorly; dense haemorrhage obscures the fundus — B-scan ultrasound required.
Subretinal fluid
Localised elevation of the retina adjacent to the tear with loss of the normal choroidal reflex through the retina. Indicates fluid has passed through the break — early RRD. Progressing subretinal fluid is a surgical emergency.
Lattice degeneration
White lattice lines (sclerosed vessels), pigment clumping, and retinal thinning in a circumferential peripheral band. May contain atrophic round holes. Horseshoe tears occur at the posterior or lateral margins of lattice patches during PVD.
Retinal dialysis
Circumferential break at the ora serrata running parallel to its edge. The peripheral retina is separated from the pars plana. Associated with blunt trauma; may be bilateral. Slow, gravity-dependent RRD.
Sudden onset floaters
New floaters, often described as a ring shape (Weiss ring), cobweb, net, or shower of dots. Represent vitreous condensates, haemorrhage, or liberated RPE cells. New floaters in isolation warrant urgent dilated examination within 24–48 hours.
Photopsia (flashes of light)
Monocular, typically temporal flashes; described as lightning, arcs, or sparks. Caused by mechanical stimulation of photoreceptors at the vitreoretinal traction site. Photopsia with new floaters significantly increases the probability of a retinal break.
Peripheral shadow or curtain
If subretinal fluid has accumulated (early RRD), patients notice a dark shadow or curtain advancing from the periphery toward central vision. This is a sign of detachment, not just a tear — urgent same-day referral.
Reduced visual acuity
Occurs when subretinal fluid reaches the macula (macula-off RRD) or when vitreous haemorrhage is dense. Normal VA does not exclude a peripheral retinal tear.
Asymptomatic
Approximately 30% of retinal tears — particularly operculated tears and atrophic round holes — are discovered incidentally on routine dilated fundus examination. Emphasises the importance of peripheral retinal screening in high-risk patients.
Rhegmatogenous retinal detachment (RRD)
The most feared and vision-threatening complication. Liquid vitreous passes through the break, progressively separating the sensory retina from the RPE. Untreated horseshoe tears carry ~40% RRD risk. Macula-off RRD carries significantly worse visual prognosis than macula-on.
Vitreous haemorrhage
Torn retinal vessel bleeds into the vitreous. Mild haemorrhage clears spontaneously; dense haemorrhage obscures the fundus and delays diagnosis. B-scan ultrasound is essential to exclude concurrent RRD in this situation.
Macula-off retinal detachment
If RRD extends beneath the macula, photoreceptor damage begins within hours. Central visual prognosis is significantly worse with longer duration of macular detachment. Surgery within 24 hours of macular involvement gives best outcomes.
Proliferative vitreoretinopathy (PVR)
Fibrocellular membranes form on the retinal surface and within the vitreous after retinal break and particularly after RRD surgery. PVR is the most common cause of surgical failure after RRD repair; causes tractional re-detachment.
Bilateral retinal detachment
10–15% of patients with RRD develop RRD in the fellow eye. The fellow eye requires full dilated peripheral examination and treatment of any predisposing lesions (lattice with holes, asymptomatic breaks).
Laser-related scotoma
Rarely, misdirected laser retinopexy burns can cause symptomatic scotomas. Risk minimised by using indirect delivery and appropriate power settings.
Stickler syndrome (type II collagen, COL2A1/COL11A1)
Autosomal dominant; the most important heritable cause of giant retinal tears and early RRD. Characterised by abnormal vitreous (membranous or beaded), high myopia, hearing loss, and craniofacial features. All first-degree relatives require dilated retinal screening.
Marfan syndrome (FBN1, fibrillin-1)
Connective tissue disorder with ectopia lentis (~50%), high myopia, and increased risk of retinal detachment. Aortic root surveillance is the primary systemic concern; ocular surveillance by optometrist/ophthalmologist is essential.
Wagner syndrome (CSPG2)
Autosomal dominant vitreoretinal dystrophy; early vitreous liquefaction, fibrillar condensation, retinal tears, and progressive chorioretinal atrophy. Distinct from Stickler but similar retinal risk profile.
Ehlers-Danlos syndrome
Collagen disorders with variable ocular involvement; some subtypes associated with high myopia and increased RRD risk.
Diabetes mellitus
Traction retinal detachment (TRD) from fibrovascular proliferative diabetic retinopathy is distinct from rhegmatogenous RRD. However, coexistent rhegmatogenous breaks can occur alongside TRD — combined tractional-rhegmatogenous RRD requires surgical repair.
Sickle cell disease
Peripheral sea-fan neovascularisation and fibrovascular proliferation can cause traction and combined tractional-rhegmatogenous RRD. High-risk patients require regular peripheral retinal surveillance.
Blunt head/ocular trauma
Non-accidental injury, road traffic accidents, and sports injuries (especially racquet sports, boxing, ball sports) are important causes of traumatic retinal dialysis — which may present weeks to months after injury with a slowly progressive inferior RRD.
Slit-lamp biomicroscopy (anterior vitreous)
Assessment for Shafer's sign (tobacco dust — pigmented RPE cells in anterior vitreous) — performed at the pupillary margin using retroillumination or indirect slit illumination. Presence is highly specific for full-thickness retinal break and mandates urgent dilated peripheral fundus examination.
Binocular indirect ophthalmoscopy (BIO) with scleral indentation
Gold standard for peripheral retinal examination. BIO provides the wide-angle view necessary to examine the vitreous base and ora serrata. Scleral indentation is essential to visualise anterior breaks and dialyses — cannot be omitted in any patient with suspected retinal tear. All four quadrants must be systematically examined.
Slit-lamp fundus examination (90D/78D lens)
Complementary to BIO for posterior equatorial tears; good stereopsis for assessing subretinal fluid depth and flap morphology. Does not reach the peripheral retina without additional lenses; scleral indentation not possible at slit-lamp.
Wide-field fundus photography (Optos)
Documents tear location, size, and associated findings (lattice, subretinal fluid, haemorrhage). Valuable for serial monitoring of conservatively managed tears and for patient education. Does not replace BIO + scleral indentation for diagnosis.
B-scan ultrasound
Essential when vitreous haemorrhage prevents fundal visualisation. Identifies retinal detachment (high-reflectivity membrane with insertion at disc and ora serrata), vitreous haemorrhage (low-reflectivity echoes), and PVD. Probe-assisted dynamic assessment of vitreoretinal traction.
OCT (posterior pole)
Not useful for diagnosing peripheral retinal tears. Used to confirm macular status (macula-on vs macula-off), assess the vitreoretinal interface for partial PVD, and detect macular involvement of extending subretinal fluid. Critical pre-operative assessment.
Visual acuity
Baseline essential — normal VA does not exclude a peripheral tear. VA reduction may indicate vitreous haemorrhage, macular involvement by extending RRD, or (rarely) co-existing pathology.
Decision Framework by Tear Type
Symptomatic horseshoe tear — TREAT urgently
Laser retinopexy or cryotherapy within 24–48 hours of diagnosis. Do not delay treatment pending further workup. Most important intervention — prevents ~95% of RRDs arising from treated horseshoe tears.
Asymptomatic horseshoe tear — TREAT (prophylactic)
Asymptomatic horseshoe tears in eyes with a complete PVD still carry significant RRD risk and should be treated prophylactically with laser retinopexy. Treat in a timely manner (within days) — not an absolute emergency but should not be deferred indefinitely.
Operculated tear — MONITOR
Operculum is avulsed; traction at the break edge is relieved. RRD risk is low (~5%). Monitor with dilated examination at 6 weeks, 6 months, then annually. Treat if subretinal fluid develops or if the patient is highly symptomatic.
Atrophic round hole — MONITOR
No vitreous traction component; RRD risk very low (<1%). Observe annually. Consider prophylactic treatment if: high myopia, strong family history of RRD, asymptomatic break in fellow eye of RRD patient.
Retinal dialysis — TREAT
Laser retinopexy or cryotherapy to demarcate all edges. If associated RRD is present, surgical repair (scleral buckle preferred — addresses the vitreous base effectively).
Giant retinal tear (GRT) — SURGICAL REFERRAL
Immediate surgical referral. PPV + perfluorocarbon liquid (PFCL) to unfold the retina + silicone oil or long-acting gas tamponade. Complex surgery; specialist vitreoretinal centre required.
RRD confirmed — SAME-DAY SURGICAL REFERRAL
Any retinal detachment requires same-day ophthalmology referral. Macula-on RRD: treat within hours to preserve central vision. Macula-off RRD: treat within 24 hours. Options: pneumatic retinopexy, scleral buckle, or PPV — depending on break characteristics and surgeon preference.
Treatment Modalities
Laser retinopexy (photocoagulation)
Standard of care for symptomatic horseshoe tears. 3 confluent rows of burns placed around the entire tear (including anterior to the operculum). Chorioretinal adhesion develops over 10–14 days — patients should be advised to avoid strenuous activity during this period. Performed under topical anaesthesia, slit-lamp delivery or indirect laser.
Transconjunctival cryotherapy
Indicated when laser is not possible (poor view due to small pupil, cataract, vitreous haemorrhage) or for anterior tears. Cryoprobe applied transconjunctivally under topical or local anaesthesia. Creates chorioretinal adhesion by freezing the RPE and outer retina. Slightly higher postoperative inflammation than laser.
Pneumatic retinopexy
Office-based procedure for superior retinal detachments with single or small cluster of superior breaks. Intravitreal gas bubble (C3F8 or SF6) injected; patient positioned to float bubble against break; laser or cryo applied around break. Success rate ~70–80% for appropriate cases; avoids general anaesthesia.
Scleral buckle
Silicone band or sponge sutured externally around the globe to indent the sclera — reduces traction at the break, brings the RPE closer to the retina. Preferred for inferior tears, young patients with strong vitreoretinal adhesion, dialyses, and traumatic RRD.
Pars plana vitrectomy (PPV)
Mainstay of modern RRD repair; preferred for complex cases, superior detachments, proliferative vitreoretinopathy, and when posterior visualisation is needed. Vitreous removal eliminates dynamic traction; endolaser retinopexy; gas or silicone oil tamponade.
Singapore Optometry Scope Note
Optometrists in Singapore use non-mydriatic fundus cameras and wide-field imaging (e.g. Optos) to assess retinal health — dilated fundus examination and binocular indirect ophthalmoscopy with scleral indentation are not within optometry scope of practice. Any patient presenting with acute onset flashes or floaters must be referred urgently to ophthalmology for full dilated peripheral fundus examination and scleral indentation to exclude a retinal tear. Fundus photography is within scope for documentation. If a curtain or peripheral shadow is reported, treat as a same-day emergency referral. Laser retinopexy and cryotherapy are performed by ophthalmologists — prompt triage and referral are the key optometric contributions.
Treated symptomatic horseshoe tear
Excellent — laser retinopexy or cryotherapy prevents RRD in >95% of treated horseshoe tears. Treatment outcome is among the most favourable in ophthalmology when performed promptly.
Untreated horseshoe tear
~40% progress to RRD, typically within weeks of initial tear formation. Risk is highest in the first 6 weeks. This underscores the urgency of same-day or next-day laser treatment.
Macula-on RRD (surgically repaired)
~90% single-operation anatomical success. VA typically good if surgery performed before macular involvement. Retinal re-attachment achieved in >95% after re-operations.
Macula-off RRD
Anatomical success remains high (~90%), but central VA recovery is incomplete and unpredictable. Photoreceptor degeneration begins within hours of macular detachment; surgery within 24 hours gives best VA outcomes. Persistent metamorphopsia is common.
Giant retinal tear
Complex surgery; anatomical success ~80–90% with modern techniques (PFCL + silicone oil). Visual recovery variable; fellow eye requires prophylactic treatment of predisposing lesions.
Fellow eye risk
10–15% of RRD patients develop RRD in the fellow eye. Thorough peripheral examination with BIO + scleral indentation and treatment of all fellow-eye breaks (horseshoe tears, symptomatic holes) is essential.
Key factors affecting prognosis
Duration of symptoms to treatment; tear type (horseshoe vs operculated); macula status at presentation; break size and location; presence of PVR; surgical technique; patient compliance with post-operative positioning.
| Condition | Key Differentiator |
|---|---|
| Uncomplicated PVD (no break) | Floaters and ring-shaped Weiss ring opacity; no Shafer's sign; no peripheral break on dilated BIO with scleral indentation; self-limiting; monitor at 6 weeks |
| Rhegmatogenous retinal detachment (RRD) | Full-thickness break + subretinal fluid extending beyond the break; curtain/shadow in vision; surgical emergency; distinguish from tear by extent of fluid on dilated examination and B-scan |
| Tractional retinal detachment (TRD) | No retinal break; fibrovascular traction from proliferative diabetic retinopathy or sickle cell; concave, immobile elevation; no subretinal fluid unless combined TRD-RRD; distinct OCT appearance |
| Exudative retinal detachment | No break; fluid from choroidal disease (tumour, VKH, posterior scleritis, choroidal effusion); smooth, convex, shifting fluid; no Shafer's sign; investigate underlying cause |
| Retinoschisis | Splitting of retinal layers (not subretinal fluid); smooth, thin, dome-shaped, immobile elevation; typically inferotemporal; no or outer-layer holes; usually benign; differentiated by OCT and B-scan |
| Vitreous haemorrhage (without break) | Dense floaters or visual loss; haemorrhage in vitreous; may obscure view; B-scan to exclude RRD; causes include diabetic retinopathy, valsalva, retinal vein occlusion — not always associated with tear |
| Choroidal melanoma | Pigmented choroidal mass causing overlying exudative detachment; B-scan shows solid mass with internal echoes; urgent ocular oncology referral; distinct from peripheral retinal break |
| Peripheral chorioretinal atrophy / pigment clumping | Benign peripheral degenerative changes; no full-thickness break; no active traction; may mimic tear on cursory examination; BIO with scleral indentation confirms integrity of retina |
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