Downie,L.E., Craig,J.P., Stapleton,F., Tan,J., Jones,L., Ng, A.Y., Hinds,M., Bosworth,C., Alster,Y. Efficacy and safety of AZR-MD-001 selenium sulfide ophthalmic ointment in adults with meibomian gland dysfunction over six months of treatment: A Phase 2, vehicle-controlled, randomized extension trial Ocular Surface 2025;35(January):15-24 [ Show Abstract ]

Purpose: To determine the efficacy and safety of AZR-MD-001 (0.5 % and 1.0 %) ophthalmic ointment, relative to vehicle, over 3–6 months of treatment, in participants with meibomian gland dysfunction (MGD).

Methods: This was a Phase 2, randomized, vehicle-controlled, multicenter extension clinical trial. Eligible participants were adults with MGD (meibomian gland secretion score (MGS) ≤12 out of 15 glands) who discontinued all other dry eye or MGD treatments. Participants were randomized 1:1:1 to apply AZR-MD-001 1.0 %, 0.5 %, or vehicle to the lower eyelids, twice weekly. Key exploratory endpoints included the least-squared mean difference between groups in the change from baseline in clinical signs (meibomian gland yielding score; MGYLS) and symptoms (Ocular Surface Disease Index; OSDI), at clinic visits at Month 4.5 and 6, and safety measures from 36 months.

Results: Participants (66.5 % female) were randomized, at baseline, to AZR-MD-001 0.5 % (n = 82), 1.0 % (n = 83), or vehicle (n = 80). Statistically significant improvements, compared to vehicle, were observed at Month 6 in MGYLS for both AZR-MD-001 groups (0.5 % group: 1.9, 95 % CI 0.9 to 2.8, P = 0.002; 1.0 % group: 1.1, 95 % CI 0.2 to 2.1, P = 0.026), and in OSDI score for the 0.5 % group (−4.5, 95 % CI -8.0 to −0.9, P = 0.0135). The most common adverse events for AZR-MD-001 were application site pain, superficial punctate keratitis and eye pain; most were mild to moderate in severity, and decreased in incidence over time.

Conclusions: AZR-MD-001 (0.5 %) was efficacious in treating signs and symptoms of MGD over six months, with a lower observed incidence of new adverse events over time.

Garg,P., Shokrollahi,P., Darge,H., Phan,C-M., Jones,L. Controlled PVA Release from Chemical-Physical Interpenetrating Networks to Treat Dry Eyes ACS Omega 2025;10(1):1249-1260 [ Show Abstract ]

Dry eye disease is becoming increasingly prevalent, and lubricating eye drops, a mainstay of its treatment, have a short duration of time on the ocular surface. Although there are various drug delivery methods to increase the ocular surface residence time of a topical lubricant, the main problem is the burst release from these delivery systems. To overcome this limitation, herein, a chemical–physical interpenetrating network (IPN) was fabricated to take control over the release of poly(vinyl alcohol) (PVA), a well-known therapeutic agent used to stabilize tear film, from gelatin methacrylate (GelMA) hydrogels. In this report, PVA was specifically used as part of a GelMA-based polymeric hydrogel owing to its physical cross-linking ability via a simple freeze-thaw method. The interpenetrating polymer network was fabricated in a sequential manner where GelMA was chemically cross-linked by photo-cross-linking, followed by physical cross-linking of PVA using a relatively short freeze-thaw cycle. Interestingly, upon applying only one short freeze-thaw cycle (of 1 or 2 h), the crystalline domains in PVA were increased in the interpenetrating network. The endothermic peaks at 48 and 60 °C in differential scanning calorimetry (DSC) thermograms and 20°–2θ peaks in X-ray diffraction (XRD) patterns suggest the presence of these crystalline domains. With the help of a suite of characterization, we further delineate the role of freeze-thaw cycles in taking control over the release of PVA. The release profiles of the PVA-containing hydrogels showed highest linearity with the Korsmeyer–Peppas model (0.9944 < R2 < 0.9952), indicating that these systems follow non-Fickian or anomalous transport.

Garg,P., Shokrollahi,P., Darge,H., Phan,C-M., Jones,L. 3D-Printed Contact Lenses to Release Polyvinyl Alcohol as a Therapeutic Agent for the Treatment of Dry Eyes Pharmaceutics 2025;17(2):Article 219 [ Show Abstract ]

Purpose: Dry eye disease is highly prevalent, and the most common treatment, lubricating eye drops, only remains effective for a very short period of time. This project aims to 3D print a proof-of-concept, custom-fit, polyvinyl alcohol (PVA)-eluting contact lens (CL) for the treatment of dry eye disease. PVA is a commonly used viscosity enhancer in eye drops, with the capability of reducing symptoms of dry eye by stabilizing the tear film and reducing tear evaporation. The protective effects of PVA could be attributed to its water-retaining ability, which provides moisturization and prevents the loss of water.

Method: In this work, a low-cost stereolithography-based 3D printer was retrofitted with a humidity and temperature control kit to 3D print a PVA-loaded custom-fit CL. To evaluate the print quality of the 3D-printed CL, circularity was used to evaluate the shape fidelity in 3D printing. The PVA release from these lenses was assessed, along with its role in acting as a viscosity enhancer. The effect of PVA was further analyzed by a dry eye disease (desiccation stress) cell model.

Results: The shape fidelity evaluation of the 3D-printed CL displayed excellent circularity. The diameter, sagittal depth, and base curve of the 3D-printed lenses were measured to be 14.27 ± 0.06 mm, 3.77 ± 0.16 mm, and 6.4 ± 0.24 mm, respectively. The PVA release curves showed that approximately 1300 µg of PVA was released over the study duration of 24 h.

Conclusions: Overall, this work demonstrates that a 3D-printed PVA-eluting CL is a promising candidate for the treatment of dry eye.

Garg,P., Shokrollahi,P., Phan,C.-M., Jones,L. Biodegradable 3D-Printed Conjunctival Inserts for the Treatment of Dry Eyes
Polymers 2025;17(5): [ Show Abstract ]

Purpose: To fabricate 3D-printed, biodegradable conjunctival gelatin methacrylate (GelMA) inserts that can release polyvinyl alcohol (PVA) when exposed to an ocular surface enzyme.

Method: In this work, biodegradable conjunctival inserts were 3D-printed using a stereolithography-based technique. The release of PVA from these insert formulations (containing 10% GelMA and 5% PVA (P-Gel-5%)) was assessed along with different mathematical models of drug release. The biodegradation rates of these inserts were studied in the presence of a tear-film enzyme (matrix metalloproteinase-9; MMP9). The morphology of the inserts before and after enzymatic degradation was monitored using scanning electron microscopy.

Results: The 3D-printed P-Gel-5% inserts formed a semi-interpenetrating network, which was mechanically stronger than GelMA inserts. The PVA release graphs demonstrate that at the end of 24 h, 222.7 ± 20.3 µg, 265.5 ± 27.1 µg, and 242.7 ± 30.4 µg of PVA were released when exposed to 25, 50, and 100 µg/mL of MMP9, respectively. The release profiles of the P-Gel-5% containing hydrogels in the presence of different concentrations of MMP9 showed the highest linearity with the Korsmeyer–Peppas model. The results suggest that the degradation rate over 24 h is a function of MMP9 enzyme concentration. Over 80% of P-Gel-5% inserts were degraded at the end of 8 h, 12 h, and 24 h in the presence of 100, 50, and 25 µg/mL MMP9 enzyme solutions, respectively.

Conclusions: These results demonstrate the potential for 3D printing of GelMA for use as conjunctival inserts. These inserts could be used to deliver PVA, which is a well-known therapeutic agent for dry eye disease. PVA release is influenced by multiple mechanisms, including diffusion and enzymatic degradation, which is supported by morphological studies and biodegradation results.

Jiang,Q., Zhang,Z., Niu,L., Wang,B., Fadel,D., Wei,R., Chen,Z. Changes in anterior segment after short-term scleral lens wear in healthy Chinese population Contact Lens Anterior Eye 2025;48(1):102291 [ Show Abstract ]

Purpose
To evaluate the impact of short-term scleral lens (SL) wear on anterior chamber (AC) dimension and central corneal thickness (CCT) in healthy Chinese people.

Methods
This is a prospective, daily wear study. Eligible participants were dispensed SLs to correct refractive errors. Anterior segment (AS) parameters were measured by AS optical coherence tomography (AS-OCT) before, during, and after 2 and 4 hours of lens wear. Repeated-measures analysis of variance (ANOVA) was used to analyze the changes in AS parameters over time.

Results
Twelve subjects (10 females and 2 males) with a mean age of 25.3 ± 3.8 years (ranging from 21 to 34 years) were recruited. The AC parameters, including anterior chamber depth (ACD) from the endothelium (endo-ACD), angle opening distance at 500 μm (AOD500), and trabecular-iris space area at 500 μm (TISA500), significantly decreased after wearing SLs for 4 hours (P<0.05). CCT increased by 12 μm (2.29 %) after wearing SLs for 4 hours (P=0.013).

Conclusion
This study suggests that SL wear has a significant impact on AS dimensions in patients with healthy corneas in the short term with SL in situ, but tend to recover quickly after SL removal. Further research is needed to determine whether the change in AS dimensions during SL wear affects aqueous humor (AH) outflow and causes changes in intraocular pressure (IOP).

Jones L, Koetting C. Dry eye pharmacological treatment update 2025

Kapadia,W., Nikhil,V., Ning,Q., Pei,Z., Phan,C.-M., Haines,L., Jones,L., Ren,C. A novel microfluidic viscometer for measuring viscosity of ultrasmall volumes of Newtonian and non-Newtonian liquids Journal of Micromechanics and Microengineering 2025;35(5):Article number 055005 [ Show Abstract ]

Viscosity is a critical fluid property that significantly influences fluid behavior and performance across various systems. Most commercial viscometers require relatively large sample volumes (on the order of milliliters), which restricts their utility in scenarios where only limited sample volumes are available. For instance, human tear fluid—essential for developing effective treatment strategies—is scarce (typically on microliters), especially in individuals with dry eye disease. To address this limitation, we present a novel microfluidic viscometer platform capable of measuring the viscosity of ultra-small volumes (i.e. ∼10 μl) of Newtonian and non-Newtonian fluids. The working principle is based on the Hagen-Poiseuille equation, incorporating the Weissenberg-Rabinowitsch-Mooney correction for slit-flow, and employs an optically transparent microfluidic chip integrated with supporting devices including a syringe pump, manifold, camera, and differential pressure transducer. Preliminary validation was conducted using glycerol solutions, artificial tears, and tear samples from dry and healthy eyes. This microfluidic viscometer holds promise for measuring the shear viscosity of small volumes of biofluid samples (e.g. synovial fluid, cerebrospinal fluid, tear films) or pharmaceuticals (e.g. monoclonal antibodies, ophthalmic drug delivery products) by developing surface coating materials appropriate for specific samples.

Lourenco Nogueira,C., Boegel,S.J., Shukla,M., Ngo,W., Hui,A., Jones,L., Aucoin,M. Antiviral activity of contact lens care solutions and rub-and-rinse regimen against adenovirus Optometry and Vision Science 2025;102(3):156-166 [ Show Abstract ]

SIGNIFICANCE
Although human adenoviruses are the leading cause of acute viral conjunctivitis, there is a lack of data surrounding the efficacy of contact lens care products against these viruses.

PURPOSE
This study investigates the antiviral activity of several commercially available contact lens care solutions against human adenovirus type 5 (Ad5).

METHODS
Six contact lens care solutions (Biotrue, Boston Simplus, OPTI-FREE Puremoist, Clear Care, cleadew, and cleadew GP) were investigated. Quantitative suspensions tests were conducted on Ad5 solutions after interaction with the different contact lens care solutions for 4 or 6 hours. For the hydrogen peroxide solution (Clear Care), interaction times of 0, 2, 4, and 6 hours prior to neutralization were also investigated. Finally, the impact of rubbing and rinsing of Ad5 contaminated contact lenses with the solutions was studied.

RESULTS
Solutions based on povidone-iodine demonstrated a more than 3-log reduction in virus after 4 and 6 hours of incubation. In contrast, hydrogen peroxide only demonstrated a 0.52-log reduction after 6 hours of incubation. Increasing the contact time with hydrogen peroxide increased Ad5 inactivation, with a 2.18-log reduction after 6 hours of incubation with the solution prior to neutralization. Nonoxidative systems did not demonstrate a significant log reduction after 4 hours of incubation. However, rubbing and rinsing of contact lenses using the nonoxidative systems reduced the virus counts from contaminated contact lenses to below the limit of quantification.

CONCLUSIONS
Povidone-iodine solutions have a significant effect on reducing the viability of Ad5. Hydrogen peroxide care solutions are effective only if unneutralized contact time is increased. Nonoxidative systems can be effective in combating contaminated lenses only with the addition of a rub-and-rinse step.

Ngo,W., Nagaarudkumaran,N., Huynh,C. B. Refrigeration reduces instillation discomfort of a 0.09% cyclosporine A solution Optometry and Vision Science 2025;102(1):14-19 [ Show Abstract ]

Significance: Topical cyclosporine A (CsA) for the treatment of dry eye disease is often associated with instillation discomfort, which may negatively influence patient adherence to therapy. This study found that refrigerating topical CsA reduced instillation discomfort compared with instillation of warm CsA. Thus, refrigerating CsA prior to instillation may improve patient experience when using CsA to manage dry eye disease.

Purpose: This study aimed to quantify instillation discomfort associated with cold or warm instillation of a 0.09% CsA.

Methods: Forty participants with symptomatic aqueous deficient dry eye were enrolled. A drop of cold (4°C) CsA was instilled in one eye, and a drop of warm (23°C) CsA was instilled in the other eye. The order and eye receiving the cold drop were randomized. Participants rated the discomfort of each eye (0, no discomfort; 10, maximal discomfort) prior to drop instillation, immediately post-instillation, and at each subsequent minute for 10 minutes. Area under the curve was used to quantify cumulative discomfort.

Results: Forty participants (39.6 ± 18.9 years old, 82% female) completed the study. A majority of participants (n = 24, 60%) experienced reduced cumulative discomfort with cold CsA, whereas the remainder experienced minimal difference (n = 10, 25%) or increased cumulative discomfort (n = 6, 15%). For those with reduced discomfort (n = 24), cumulative discomfort associated with cold instillation (median, 11.5 [2.2, 20.0]) was significantly lower (p<0.01) than cumulative discomfort associated with warm instillation (median, 17.5 [11.2, 32.2]). Cold instillation was associated with a median reduction of 1 discomfort point immediately post-instillation and at all subsequent time points (all p≤0.04, but not significant at t = 10), compared with warm instillation.

Conclusions: Up to 60% of participants found that cold instillation of CsA solution induced less discomfort than warm instillation, lasting up to 9 minutes post-instillation. In contrast, although 15% of participants found reduced discomfort with warm instillation, the magnitude of discomfort associated with warm instillation was not significantly different than cold instillation.

Phan,C-M., Hui,A., Shi,X., Zheng,Y., Subbaraman,L., Wu,J., Jones,L. The Impact of Comfort Eluting Agents and Replacement Frequency on Enhancing Contact Lens Performance Clinical Ophthalmology 2025;19(March 12):857-873 [ Show Abstract ]

This review explores the development and clinical implications of soft contact lenses designed to elute comfort agents, emphasizing their role in enhancing user experience and ocular health. As discomfort remains one of the primary reasons for discontinuation of lens wear, this concept aims to address this challenge by gradually releasing these agents over their period of use. This review also explores the effectiveness, safety, and user satisfaction associated with frequent replacement schedules of these lenses. Clinical trials demonstrate that lenses with eluting comfort agents significantly reduce dryness and irritation, leading to improved wear-time and overall comfort. The findings suggest that frequent replacement not only enhances lens hygiene but also maximizes the therapeutic benefits of the eluted agents, promoting a healthier ocular environment. The implications for practice highlight a shift towards more patient-centered approaches in contact lens design and management, aiming to improve adherence and satisfaction among users. This research paves the way for future innovations in contact lens technology, focusing on personalized solutions that cater to individual comfort needs.

Phan,C. M., Wulff,D., Thacker,M., Hui,A. Drug releasing contact lenses and their application to disease presentations
Clinical and Experimental Optometry 2025;Online ahead of print [ Show Abstract ]

Eye drops, the most common method for anterior segment treatment, face challenges of inefficiency, with less than 7% instilled drugs typically reaching target tissues of interest. The advent of contact lens drug delivery systems offers a paradigm shift, enhancing drug residence time and bioavailability on the ocular surface. This review focuses on the considerations and challenges in developing contact lenses for drug delivery, particularly for managing four categories of ocular diseases: anterior segment infections, dry eye disease, ocular allergies, and glaucoma. Each disease category requires tailored therapeutic approaches, and the technical intricacies of drug-releasing contact lenses must address concerns related to lens properties, drug release duration, and safety. The aim of this review is to provide insights into the therapeutic needs of ocular diseases and offer a comprehensive overview of the progress made in this innovative approach. The emergence of a commercially available ketotifen fumarate-releasing lens serves as a testament to the feasibility and potential benefits of this innovative approach, paving the way for further refinement and targeted applications in ocular therapeutics.

Richards,J., Jaskulski,M., Woods,J., Guthrie,S., Kollbaum,P. Optical characterisation and vision quality assessment of two myopia control contact lenses Ophthalmic and Physiological Optics 2025;Online ahead of print [ Show Abstract ]

Purpose
This investigation examined the image and vision quality of two commercially available daily disposable myopia control soft contact lenses.

Methods
Wavefront errors were measured with an SHS Ophthalmic aberrometer for two myopia control soft contact lenses: a coaxially designed dual-focus lens (omafilcon A, CooperVision MiSight® 1 day, MS1d) and a design employing multiple add powers that included non-coaxial optics in annular add zones (senofilcon A, Johnson & Johnson Vision ACUVUE® Abiliti™ 1-Day, AB). Geometric optics ray tracing generated point-spread functions and wave optics were used to compare modulation transfer functions (MTFs) and simulated letter images. Twenty-six myopic children completed a randomised, non-dispensing, contralateral double-masked clinical trial. After 1 h of wear, right and left eye visual acuity (VA), subjective vision quality and lens preference (Likert) were assessed while viewing monocularly.

Results
The lens containing non-coaxial optics employed a small central zone with approximately +10.00 D of added power and two annular rings with a power gradient typical of non-coaxial optics. The coaxial design contained a centre zone with a distance correction and two annular zones with a fixed add power of approximately +2.00 D. MTFs and simulated images were better with small pupils, which was most noticeable with the coaxial design. Distance VA was -0.02 ± 0.04 with MS1d and 0.09 ± 0.08 with AB, p < 0.01. The majority of participants (77%) reported a preference for one lens; 54% preferred the MS1d and 23% preferred the AB lens.

Conclusions
Myopia control contact lenses employing coaxial or a mixture of coaxial and non-coaxial optics both reduced retinal image contrast but successfully imaged high spatial frequencies and provided high quality of vision. Image and vision quality were slightly superior in the lens employing coaxial optics alone.

Shokrollahi,P., Garg,P., Wulff,D., Hui,Al., Phan,C-M., Jones,L. Vat Photopolymerization 3D Printing Optimization: Analysis of Print Conditions and Print Quality for Complex Geometries and Ocular Applications International Journal of Pharmaceutics 2025;668(January):Article 124999 [ Show Abstract ]

Abstract: 3D printing, also known as additive manufacturing, continues to reshape manufacturing paradigms in healthcare by providing customized on-demand object fabrication. However, stereolithography-based 3D printers encounter a conflict between optimizing printing parameters, requiring more time, and print efficiency, requiring less time. Moreover, commonly used metrics to assess shape fidelity of 3D printed hydrogel materials like ‘circularity’ and ‘printability’ are limited by the soft nature of hydrogels, that can cause irregularities in their boundary. To unlock the full potential of 3D printing of biomaterials, it is also necessary to understand correlation between printing parameters and ink properties. In this work, a method based on curing depth, overcuring (cumulative cure), and print thickness was developed, which enables a time-efficient and reliable determination of printing conditions for complex geometries using gelatin methacrylate hydrogel biomaterial ink. We also examined the impact of printing direction on the print quality in terms of object/print thickness and aspect ratio. Moreover, the effects of dye concentration, exposure time, and layer thickness on print quality were evaluated, with discussions focused on the correlation between print dimension to layer thickness. Further evaluation was achieved by successfully printing bioinspired corneal stroma-like scaffold and delicate structures like a contact lens and a model eyeball, substantially expanding the scope of this method in producing high-quality prints with intricate details. We also demonstrate the effectiveness of ‘Feret ratio,’ another measure of object shape, in assessing the shape fidelity of different prints. Overall, the results highlight the practical potential of this method in enhancing the speed and reliability of the 3D printing processes involving complex geometries using a low-cost 3D printers.

Zhang,H.Y., Xu,F.Y., Liu,K.K.K., Chan,Y.P., Chow,A., Jones,D., Lam,C.S.Y. Myopia Management in Hong Kong Journal of Clinical Medicine 2025;14(3):Article 698 [ Show Abstract ]

Objectives: We aimed to investigate how optometrists in Hong Kong are managing myopic and "pre-myopic" children.

Methods: Clinical files for children aged 6 to 10 years old who had eye examinations from 2017 to 2021 were retrospectively reviewed. Children were grouped by the initial spherical equivalent refractive error (SER) as myopes or pre-myopes. The demographic data, refractive error, and myopia management recommended by the optometrists were analyzed.

Results: A total of 1,318 children (859 myopes and 459 pre-myopes) from ten clinics in Hong Kong were included. Over 5 years, myopia management recommendations shifted significantly (p < 0.001). In 2017, only 18.4% of children were recommended to pursue myopia control (MC), increasing to 42.8% by 2021. The use of MC spectacle lenses increased from 7.3% in 2017 to 36.8% in 2021, becoming the most recommended option. Orthokeratology, MC contact lenses, and atropine remained stable at less than 5% over this period. Children recommended for MC approaches had significantly more myopia than those recommended single-vision lenses or monitoring (p < 0.05). Age of the first visit significantly correlated with SER change from the first visit to the next recommendation update for pre-myopes (r = 0.27, p = 0.013) but not for myopes.

Conclusions: From 2017 to 2021, myopia management patterns in Hong Kong shifted significantly, with more children being recommended for myopia control. MC spectacle lenses emerged as the most commonly recommended method. Younger pre-myopes at their first visit were more likely to have earlier management updates.