Paranasal sinus disease encompasses a broad spectrum of inflammatory, infectious, allergic, fungal, obstructive, and expansile disorders involving the maxillary, ethmoid, frontal, and sphenoid sinuses. Because of the intimate anatomical relationship between these sinuses and the orbit, disease arising within the paranasal sinuses may manifest initially or predominantly with ophthalmic symptoms. Orbital complications remain among the most clinically important complications of rhinosinusitis because delayed recognition can result in permanent visual impairment, intracranial extension, and, rarely, mortality.¹⁻³ The ethmoid sinuses are particularly important in the development of orbital complications. The orbit is separated from the ethmoid air cells by the lamina papyracea, a very thin bony structure that may contain congenital or acquired dehiscences. Infection and inflammation may therefore extend directly from the ethmoid sinus into the orbit. Spread may also occur through valveless venous channels connecting the sinonasal and orbital circulation.²,⁴ Maxillary, frontal, and sphenoid sinus disease can similarly produce orbital manifestations through direct extension, vascular pathways, bone erosion, or expansion of lesions such as mucoceles. Ophthalmic manifestations vary considerably according to the underlying sinus pathology and severity of orbital involvement. Patients may present with eyelid edema, periorbital pain, epiphora, chemosis, proptosis, globe displacement, diplopia, ptosis, restriction of ocular movements, or decreased visual acuity. More advanced disease may cause orbital cellulitis, subperiosteal abscess, orbital abscess, optic neuropathy, and cavernous sinus thrombosis.¹,² Al Anazy and Al Dousary proposed a broader clinical grading system for ophthalmic manifestations of paranasal sinus disease encompassing anatomical disturbance, functional involvement, orbital infection, and visual impairment.¹ Traditionally, infectious orbital complications have also been described using the Chandler classification as inflammatory/preseptal edema, orbital cellulitis, subperiosteal abscess, orbital abscess, and cavernous sinus thrombosis.³,⁵ Contemporary management increasingly combines clinical examination with computed tomography (CT) or magnetic resonance imaging (MRI), because imaging provides important information regarding postseptal involvement, abscess formation, sinus distribution, bone erosion, and intracranial extension.⁵ A long-term study by Chang et al. demonstrated that limitation of extraocular movement, proptosis, elevated intraocular pressure, reduced visual acuity, and relative afferent pupillary defect were associated with more severe sinusitis-related orbital disease.² Consequently, careful ophthalmological assessment is essential whenever orbital involvement is suspected. The present study was designed to evaluate the clinical spectrum of ophthalmic manifestations among patients with paranasal sinus disease and to determine the relationship between sinus pathology, radiological involvement, treatment, and ophthalmic outcome. Aim To study the ophthalmic manifestations associated with paranasal sinus disease and assess their clinical characteristics, radiological findings, management, and outcomes. Objectives 1. To determine the frequency and spectrum of ophthalmic manifestations in paranasal sinus disease. 2. To identify the paranasal sinuses most commonly associated with ophthalmic involvement. 3. To evaluate the relationship between underlying sinus pathology and ocular manifestations. 4. To assess treatment modalities and ophthalmic outcomes. 5. To identify clinical features associated with potentially sight-threatening orbital involvement.

Study Design and Setting This hospital-based observational study was conducted jointly by the Departments of Otorhinolaryngology and Ophthalmology at a tertiary care teaching hospital. Patients presenting with clinically and radiologically confirmed paranasal sinus disease associated with ophthalmic manifestations were consecutively evaluated during the study period. Study Population A total of 100 patients fulfilling the eligibility criteria were included. Patients of all age groups and both sexes with acute rhinosinusitis, chronic rhinosinusitis, allergic fungal rhinosinusitis, paranasal sinus mucocele, or other nonmalignant paranasal sinus disorders producing ophthalmic manifestations were considered eligible. Inclusion Criteria Patients were included when they had: • Clinically and/or radiologically confirmed paranasal sinus disease. • At least one ophthalmic manifestation attributable to the sinus disease. • Availability of complete ophthalmological and ENT evaluation. • Appropriate imaging where clinically indicated. Exclusion Criteria Patients with orbital manifestations primarily attributable to orbital trauma, primary orbital tumors, thyroid eye disease, primary ocular infection, congenital orbital abnormalities, or other disorders unrelated to paranasal sinus pathology were excluded. Clinical Evaluation A detailed history was obtained regarding nasal obstruction, nasal discharge, facial pain or pressure, headache, fever, reduction in smell, previous episodes of sinusitis, diabetes mellitus, immunosuppression, and previous sinonasal surgery. Ophthalmological examination included best-corrected visual acuity, pupillary reactions and assessment for relative afferent pupillary defect, eyelid examination, ocular alignment, extraocular movements, diplopia assessment, proptosis evaluation, anterior segment examination, intraocular pressure measurement where feasible, and dilated fundus examination. Specific ocular manifestations documented included eyelid/periorbital edema, proptosis, globe displacement, epiphora, chemosis, diplopia, ptosis, restricted ocular motility, ocular pain, reduced visual acuity, optic disc changes, and features of orbital infection. Radiological Evaluation CT of the paranasal sinuses and orbit was the principal imaging modality. Images were evaluated for mucosal thickening, sinus opacification, air-fluid levels, expansion of sinus cavities, bone erosion, orbital extension, subperiosteal collection, orbital abscess, and involvement of adjacent intracranial structures. MRI was reserved for selected patients with suspected optic nerve, cavernous sinus, intracranial, or invasive fungal involvement. Treatment Treatment was individualized according to the underlying pathology and severity. Patients with uncomplicated inflammatory disease received appropriate medical treatment. Intravenous broad-spectrum antibiotics were administered in patients with significant orbital infection. Endoscopic sinus surgery with drainage of involved sinuses and/or orbital collections was performed when indicated. Antifungal therapy and surgical debridement were considered for invasive fungal disease. Outcome Assessment Patients were followed for resolution of eyelid edema, proptosis, diplopia, ocular motility abnormalities, infection, and improvement or deterioration of visual acuity. Statistical Analysis Data were entered into a spreadsheet and analyzed using appropriate statistical software. Categorical variables were expressed as frequencies and percentages. Continuous variables were summarized as mean ± standard deviation. Associations between categorical variables were assessed using the chi-square test or Fisher's exact test. A p value <0.05 was considered statistically significant. Ethical Considerations Institutional Ethics Committee approval should be obtained before conducting the study. Written informed consent should be obtained from adult participants and from parents or legal guardians for minors. Patient confidentiality should be maintained throughout the study.

Note: The following numerical results are an illustrative dataset prepared to demonstrate publication-ready tables. They should be replaced by actual patient observations before manuscript submission. A total of 100 patients with paranasal sinus disease and associated ophthalmic manifestations were evaluated. The mean age was 35.8 ± 16.4 years. There were 58 males and 42 females, giving a male-to-female ratio of 1.38:1. Table 1. Demographic characteristics of study participants Characteristic Number (n=100) Percentage Age ≤20 years 18 18% 21–40 years 39 39% 41–60 years 29 29% >60 years 14 14% Male 58 58% Female 42 42% Unilateral ocular involvement 82 82% Bilateral ocular involvement 18 18% Explanation: The largest proportion of patients belonged to the 21–40-year age group. Ophthalmic involvement was predominantly unilateral. Table 2. Underlying paranasal sinus disease Sinus pathology Number Percentage Chronic rhinosinusitis 42 42% Acute rhinosinusitis 27 27% Allergic fungal rhinosinusitis 18 18% Paranasal sinus mucocele 8 8% Other sinus lesions 5 5% Explanation: Chronic rhinosinusitis constituted the most frequent underlying sinus disorder. Acute rhinosinusitis was the second most common condition, while allergic fungal rhinosinusitis accounted for almost one-fifth of patients. Table 3. Ophthalmic manifestations among patients Ophthalmic manifestation Number Percentage Eyelid/periorbital swelling 52 52% Proptosis 35 35% Epiphora 29 29% Diplopia 24 24% Restricted ocular movements 22 22% Chemosis 18 18% Decreased visual acuity 15 15% Ocular/periorbital pain 14 14% Ptosis 11 11% Globe displacement 9 9% Relative afferent pupillary defect 5 5% Multiple manifestations were present in several patients. Explanation: Eyelid or periorbital swelling was the commonest ophthalmic manifestation, occurring in more than half of the study population. Proptosis was observed in 35%, while diplopia and restriction of ocular movements were documented in approximately one-quarter. Fifteen percent had reduced visual acuity, indicating clinically important optic or orbital involvement. Table 4. Distribution of paranasal sinus involvement Sinus involved Number Percentage Ethmoid 68 68% Maxillary 61 61% Frontal 32 32% Sphenoid 21 21% Multiple sinuses 56 56% Patients could have more than one sinus involved. Explanation: Ethmoid sinus disease was most frequently associated with ophthalmic manifestations, followed by maxillary sinus involvement. More than half of the patients had involvement of multiple paranasal sinuses. Table 5. Orbital complications detected clinically/radiologically Orbital complication Number Percentage Preseptal inflammatory involvement/cellulitis 30 30% Orbital cellulitis 17 17% Subperiosteal abscess 10 10% Orbital abscess 4 4% Optic nerve involvement 5 5% Cavernous sinus/intracranial extension 2 2% Explanation: Preseptal inflammatory involvement was the most frequent infectious orbital complication. Advanced complications such as orbital abscess, optic nerve involvement, and intracranial extension were less frequent but represented the major threat to vision. Table 6. Treatment modalities and outcomes Parameter Number Percentage Medical management alone 39 39% Endoscopic sinus surgery ± medical treatment 49 49% Combined sinus/orbital drainage 12 12% Complete ophthalmic recovery 74 74% Partial improvement 20 20% Persistent visual/ocular deficit 6 6% Explanation: Most patients required either endoscopic sinus surgery or combined medical and surgical treatment. Overall ophthalmic outcomes were favorable, with 74% demonstrating complete recovery. Persistent deficits occurred primarily among patients who presented with severe visual impairment or advanced orbital involvement.

Paranasal sinus disorders can produce a broad range of ophthalmic manifestations because the orbit shares close anatomical boundaries and vascular communications with the paranasal sinuses. The present study demonstrated that ocular manifestations ranged from relatively mild eyelid edema and epiphora to proptosis, ophthalmoplegia, orbital infection, and visual impairment. In the present illustrative cohort, chronic rhinosinusitis was the most frequent underlying pathology, followed by acute rhinosinusitis and allergic fungal rhinosinusitis. Al Anazy and Al Dousary evaluated 42 patients with ophthalmic complications of paranasal sinus disease and found allergic fungal sinusitis and chronic rhinosinusitis to be important underlying causes. They reported proptosis as the most frequent manifestation and noted that patients who had already developed visual impairment had less favorable outcomes.¹ This observation emphasizes that ophthalmic manifestations are not restricted to acute bacterial sinusitis but may also accompany chronic, fungal, and expansile sinus disease. Eyelid/periorbital swelling was the most frequent ophthalmic manifestation in the present series. Proptosis, epiphora, diplopia, restricted ocular movements, and chemosis were also common. These manifestations reflect different degrees of orbital inflammation, increased intraorbital pressure, mechanical displacement, and involvement of extraocular muscles. The ethmoid sinus was most commonly involved. This finding can be explained by the intimate relationship between the ethmoid air cells and medial orbital wall. Sinonasal infection may spread to orbital tissues through bony dehiscence or venous pathways. Chang et al. reported maxillary and ethmoid sinus involvement in 81.9% and 75.9%, respectively, among 83 patients with sinusitis-related orbital complications.² They also found that extraocular movement limitation, proptosis, elevated intraocular pressure, reduced visual acuity, and relative afferent pupillary defect were associated with more severe disease.² Orbital cellulitis, subperiosteal abscess, and orbital abscess represent progressively important postseptal complications. Contemporary studies emphasize combining clinical findings with CT imaging rather than relying solely on historical clinical classifications.⁵ Anselmo-Lima et al. similarly demonstrated the importance of CT findings in evaluating orbital complications of acute rhinosinusitis and highlighted the need for prompt surgical treatment together with intravenous antimicrobial therapy in orbital abscess.⁵ Visual impairment represents one of the most serious manifestations of paranasal sinus disease. Visual loss can occur through optic nerve compression, ischemia, inflammatory optic neuropathy, elevated orbital pressure, direct infection, or vascular complications. In the Taiwanese series, permanent visual loss occurred in patients with advanced intracranial-stage disease despite intensive management.² Thus, reduced visual acuity, abnormal pupillary responses, severe ophthalmoplegia, or rapidly progressive proptosis should be regarded as warning features. Management depends on disease severity and etiology. Medical therapy may be sufficient for selected uncomplicated cases, whereas postseptal infection, abscess formation, visual deterioration, fungal disease, or failure to respond to medical treatment may require urgent surgical intervention. A multidisciplinary approach involving otorhinolaryngologists, ophthalmologists, radiologists, infectious-disease specialists, and neurosurgeons when intracranial extension is suspected can facilitate timely diagnosis and treatment.²,⁶ The favorable outcomes observed in most patients reinforce the importance of early recognition. However, persistent visual deficits among patients presenting with advanced disease demonstrate that treatment after optic nerve or vascular injury may not completely restore vision. Ophthalmic manifestations should therefore be considered important clinical indicators of the extent and severity of paranasal sinus disease.

Paranasal sinus disease may present with a wide spectrum of ophthalmic manifestations. Eyelid/periorbital swelling, proptosis, epiphora, diplopia, chemosis, and restricted ocular movements are common presentations, while reduced visual acuity, optic neuropathy, orbital abscess, and intracranial extension represent potentially sight- or life-threatening complications. Ethmoid and maxillary sinus disease are frequently associated with orbital involvement because of their close anatomical relationship with the orbit. Detailed ophthalmological examination combined with CT imaging of the paranasal sinuses and orbit is essential in patients with suspected orbital involvement. The presence of proptosis, painful or restricted ocular movements, reduced visual acuity, relative afferent pupillary defect, or features of postseptal infection should prompt urgent evaluation and management. Early multidisciplinary intervention can provide favorable functional outcomes and reduce the risk of permanent visual loss.

1. Al Anazy FH, Al Dousary SH. Ophthalmic manifestations of paranasal sinus disease: a clinical grading system. Int Forum Allergy Rhinol. 2012;2(4):331-335. doi:10.1002/alr.21029. 2. Chang YS, Chen PL, Hung JH, Chen HY, Lai CC, Ou CY, et al. Orbital complications of paranasal sinusitis in Taiwan, 1988 through 2015: acute ophthalmological manifestations, diagnosis, and management. PLoS One. 2017;12(10):e0184477. doi:10.1371/journal.pone.0184477. 3. Chandler JR, Langenbrunner DJ, Stevens ER. The pathogenesis of orbital complications in acute sinusitis. Laryngoscope. 1970;80(9):1414-1428. 4. Velasco e Cruz AA, Demarco RC, Valera FCP, Santos AC, Anselmo-Lima WT, Marquezini RMS. Orbital complications of acute rhinosinusitis: a new classification. Braz J Otorhinolaryngol. 2007;73(5):684-688. doi:10.1016/S1808-8694(15)30130-0. 5. Anselmo-Lima WT, Soares MR, Fonseca JP, Garcia DM, Velasco e Cruz AA, Tamashiro E, et al. Revisiting the orbital complications of acute rhinosinusitis. Braz J Otorhinolaryngol. 2023;89(5):101316. doi:10.1016/j.bjorl.2023.101316. 6. Presutti L, Lucidi D, Spagnolo F, Molinari G, Piccinini S, Alicandri-Ciufelli M. Surgical multidisciplinary approach of orbital complications of sinonasal inflammatory disorders. Acta Otorhinolaryngol Ital. 2021;41(Suppl 1):S108-S115. doi:10.14639/0392-100X-suppl.1-41-2021-11. 7. Mortimore S, Wormald PJ. The Groote Schuur Hospital classification of the orbital complications of sinusitis. J Laryngol Otol. 1997;111(8):719-723. 8. Chaudhry IA, Al-Rashed W, Arat YO. The hot orbit: orbital cellulitis. Middle East Afr J Ophthalmol. 2012;19(1):34-42. 9. Oxford LE, McClay J. Medical and surgical management of subperiosteal orbital abscess secondary to acute sinusitis in children. Int J Pediatr Otorhinolaryngol. 2006;70(11):1853-1861. 10. Georgakopoulos CD, Eliopoulou MI, Stasinos S, Exarchou A, Pharmakakis N, Varvarigou A. Periorbital and orbital cellulitis: a 10-year review of hospitalized children. Eur J Ophthalmol. 2010;20(6):1066-1072. 11. Siedek V, Kremer A, Betz CS, Tschiesner U, Berghaus A, Leunig A. Management of orbital complications due to rhinosinusitis. Eur Arch Otorhinolaryngol. 2010;267(12):1881-1886. 12. Botting AM, McIntosh D, Mahadevan M. Paediatric pre- and post-septal peri-orbital infections are different diseases: a retrospective review of 262 cases. Int J Pediatr Otorhinolaryngol. 2008;72(3):377-383. 13. Tanna N, Preciado DA, Clary MS, Choi SS. Surgical treatment of subperiosteal orbital abscess. Arch Otolaryngol Head Neck Surg. 2008;134(7):764-767. 14. Rahbar R, Robson CD, Petersen RA, DiCanzio J, Rosbe KW, McGill TJ, et al. Management of orbital subperiosteal abscess in children. Arch Otolaryngol Head Neck Surg. 2001;127(3):281-286. 15. Gavriel H, Jabrin B, Eviatar E. Management of superior subperiosteal orbital abscess. Eur Arch Otorhinolaryngol. 2016;273(1):145-150.