YAG Laser Vitreolysis for Floaters

University Hospital of Split

Status: Unknown

Conditions: Vitreous Detachment

Treatments: Procedure: Nd: YAG laser

Study type: Interventional

Funder types: Other

Identifiers

NCT03970148

2181-147-01/06/M.S.-19-2

Details and patient eligibility

About

Vitreous fluid, containing 95% water, fills the space behind the lens. Its gelatinous consistency is due to the presence of hyaluronic acid, mucopolysaccharide and collagen fibers. With age, the collagen aggregates into parallel bundles, bound by cross links, leaving the pockets of liquid in the glass body. This redistribution is referred to as syneresis, which is found in 90% older than 40 years. After liquefaction, the vitreous enters the retroviral space and separates the posterior hyaloid membrane from the retina. When separating from the optical disk it forms an annular formation (Weiss ring) in front of the optical disc. These agglomerated collagen bundles (opacities) disperse the photons of light and are perceived by the patients as a "gray silhouette-like artifact". Two major interventions for these symptoms include Nd: YAG laser vitreolysis and vitrectomy. The less invasive method Nd: YAG laser increases the temperature of the opacity thus vaporizing them to smaller fragments that are easier to sediment onto the bottom of the vitreous cavity thereby relieving the symptoms.

Enrollment: 100 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age 18 years or older
• Is able to give written informed consent to the procedure
• Patients with clinical symptoms of floaters and clinically confirmed diagnosis of opacity in the vitreous body.

Exclusion criteria

• Inability to tolerate the procedure
• Blurred anterior eye segment
• Cataract or Intraocular lens opacity
• Blurred posterior eye segment
• Active eye inflammation
• Iris synechiae
• Uncontrolled intraocular pressure elevation
• Peripheral retinal degeneration

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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100 participants in 1 patient group

Nd: YAG laser treatment

Experimental group

Description:

Before treatment an optical coherence tomography (OCT) scan of the macula is performed to monitor possible macular oedema. After application of anesthetic and midriatics drops, the patient is positioned on the chin and forhead support (ND: YAG laser). Then, a contact lens (panfundoscope) is filled with methylcellulose and placed on the cornea. The laser is focused on the opacity that is to be treated and the first laser stamp of an initial power of 3 mJ is applied. The measured direct effect will guide in further adjustment of the laser beam power to achieve the desired effect. After treatment, a single drop of corticosteroid is applied to the patient and an ocular patch is applied. On follow up days an OCT scan of the macula is performed to monitor possible side effects.

Treatment:

Procedure: Nd: YAG laser