What is the ROPLAS Test?
ROPLAS (Regurgitation on Pressure over Lacrimal Sac) is a clinical screening test where the examiner applies digital pressure over the lacrimal sac area to check for regurgitation of fluid or mucoid material from the puncta, indicating nasolacrimal duct obstruction (NLDO).
Test Technique and Interpretation
The test is performed by applying firm pressure over the medial canthal area where the lacrimal sac is located. A positive test occurs when material (clear fluid or mucoid discharge) regurgitates back through either the upper or lower punctum, confirming obstruction in the lacrimal drainage system 1.
Regurgitation Patterns
The pattern of regurgitation provides diagnostic information about the level of obstruction:
- Same punctum regurgitation: Suggests blockage in that specific canaliculus
- Opposite punctum regurgitation: Indicates either common canalicular obstruction or nasolacrimal duct obstruction
- Mucoid discharge: Associated with chronic dacryocystitis and predicts higher failure rates with conservative management 2
Clinical Performance Characteristics
The diagnostic accuracy of ROPLAS varies significantly depending on the clinical context:
High specificity, low sensitivity profile: ROPLAS demonstrates excellent specificity (99.3-100%) but poor sensitivity (54.5%) when compared to lacrimal irrigation 1, 3. This means:
- Positive ROPLAS is highly reliable - when regurgitation occurs, chronic dacryocystitis is confirmed with near certainty 3
- Negative ROPLAS does not rule out obstruction - approximately half of actual obstructions will be missed 1
The positive predictive value is 75.3% and negative predictive value is 99.4-99.5% 1, 3.
Clinical Applications
Preoperative Cataract Screening
ROPLAS is widely used in India and other settings to screen for NLDO before intraocular surgery, as undetected chronic dacryocystitis increases endophthalmitis risk. However, current evidence shows that ROPLAS alone is insufficient for comprehensive preoperative screening 1.
A 2022 study found that using ROPLAS as the sole screening method missed nearly half of nasolacrimal obstructions that would have been detected by irrigation 1. Despite this limitation, a 2021 comparative study showed no significant difference in post-cataract endophthalmitis rates between eyes screened with ROPLAS versus lacrimal irrigation (0.051% vs 0.039%, P=0.517) 4.
Practice Pattern Considerations
Survey data reveals that 59.6% of Indian oculoplastic surgeons consider ROPLAS sufficient for pre-cataract screening, while 32.6% prefer lacrimal irrigation 5. The COVID-19 pandemic shifted many centers toward ROPLAS to reduce aerosol-generating procedures 4.
Clinical Recommendations
For routine preoperative screening before cataract surgery: Perform both ROPLAS and lacrimal irrigation rather than relying on ROPLAS alone 1. The low sensitivity means that negative ROPLAS cannot safely exclude obstruction in this high-stakes setting.
When ROPLAS is positive: No additional testing is needed - the high specificity confirms obstruction and warrants treatment (typically dacryocystorhinostomy) before proceeding with intraocular surgery 3.
In resource-limited settings: If irrigation is unavailable, negative ROPLAS may be acceptable when clinical suspicion is low, given the high negative predictive value of 99.5% 3. However, maintain heightened vigilance for any equivocal findings or symptoms suggesting obstruction.
Pediatric Applications
In congenital NLDO, mucoid ROPLAS predicts treatment failure - children with mucoid discharge are nearly 6 times more likely to fail conservative sac massage (OR=5.55) compared to those with clear discharge 2.