Dry eye and glaucoma may be the two most confounding conditions ophthalmologists face. Meanwhile, several investigative treatments for both chronic ailments will continue to move forward.
Undry Those Eyes
Based on a 2022 study in JAMA Ophthalmology, about 27 million Americans have some form of DED or meibomian gland dysfunction. Treatments aim to preserve and enhance tears and tear production to counteract the grittiness and itchiness that accompany DED.
“For decades, we only had one treatment [cyclosporine] for dry eye, then the second one a few years ago, which is lifitegrast, but nothing innovative until very recently,” Marjan Farid, MD, director of cornea, cataract and refractive surgery at the Gavin Herbert Eye Institute at the University of California-Irvine, told this news organization.
“In 2023, I feel that innovation from the pharmaceutical standpoint in this space really exploded, and it’s very exciting because dry eye disease is such a multifactorial disease that you can’t just go after one angle,” said Dr. Farid, who is also chair of the American Society of Cataract and Refractive Surgery’s cornea clinical committee. “You really need to be able to attack dry eye disease from multiple areas, when the meibomian glands are involved, or whether or not there’s blephartitis.”
The three treatments for DED the FDA approved last year are lotilaner 0.25% ophthalmic solution, which targets the Demodex mites that cause of Demodex blepharitis, a trigger for DED; perfluorohexyloctane ophthalmic solution; and cyclosporine ophthalmic solution 0.1%. The latter two agents coat the ocular surface — perfluorohexyloctane acting as a shield to prevent tear evaporation and cyclosporine 0.1% using perfluorobutylpentane to allow the immunosuppressant cyclosporine to penetrate deeper into the eye.
This year, Dr. Farid said, while ophthalmologists will be adopting those treatments, they’ll also be watching three emerging treatments poised to report results from clinical trial or take other steps toward FDA approval. They include:
- Selenium sulfide 0.5% ophthalmic ointment will move into phase 3 trials. This ointment is applied directly to the lower eyelid to open the meibomian gland (MGs), secretions from which prevent tear evaporation and tear overflow. Results last year from a phase 2 trial demonstrated improvement in MG secretions in treated patients. “It’s a very unique compound because it’s the only compound that could potentially open the meibomian gland orifices along lid margin and improve the quality of secretions,” Dr. Farid said.
- Reproxalap, a reactive aldehyde species (RASP) inhibitor, will be the subject of a new drug application (NDA) resubmission this year. RASPs have been found in elevated levels in ocular and systemic inflammatory disease. The FDA last year notified drug developer Aldeyra Therapeutics that an additional trial was needed to demonstrate efficacy in treating symptoms of DED. Aldeyra said it would resubmit the NDA and report topline trial results in the first half of the year. “That’s a really nice anti-inflammatory eye drop that works early in the inflammatory cascade,” Dr. Farid said. “It acts almost like a steroid does without having the side effects of the steroid.”
- AR-15512, a topical transient receptor potential melastatin 8 agonist, may also be the subject of an NDA this year. Topline results from two phase 3 trials last year demonstrated a clinically meaningful increase in tear production.
The Centers for Disease Control and Prevention estimates 3 million Americans have glaucoma. The use of daily eye drops to lower intraocular pressure (IOP) has been a mainstay of glaucoma therapy treatment for decades. However, a 2018 study put the rates of nonadherence as high at 67%.
In part to skirt the adherence issue, several approaches have evolved to lower IOP without relying on drops. They include laser treatments to perforate the eye’s trabecular meshwork and improve the outflow of aqueous humor, minimally invasive glaucoma surgery to create a small tunnel or even insert a shunt to enable aqueous outflow, and, more recently, implantable depots that release IOP-lowering drugs within the eye over months.
“Glaucoma is a disease that has a slow onset, so you have to diagnose it as early as possible,” Andrew Iwach, MD, a glaucoma specialist in San Francisco and clinical spokesperson for the American Academy of Ophthalmology, told this news organization. “One challenge with glaucoma is its chronic nature. There are different methods that are being looked at to achieve sustained release of drugs — ways you can implant a little bolus of this medicine,” Dr. Iwach added.
Glaucoma also requires regular monitoring of changes in IOP, Iwach noted. “During COVID, there was an increased interest in during this remotely,” he said. A remote monitoring platform, Peripherex, was registered last year with the FDA. It consists of a diagnostic online visual field test that can enable patients with glaucoma to provide data on disease changes from home.
A laser platform, the Belkin Eagle Nd:YAG laser for performing selective laser trabeculoplasty (SLT), in December 2023 received FDA clearance. Dr. Iwach said this is the first innovation in lasers in 20 years in that it eliminates the need for placing a diagnostic lens on the eye itself to direct the laser pulses, a technique called direct SLT. It uses a computer-driven tacking device.