Trabeculotomy in the immature, enucleated human eye

Area of Science:

• Ophthalmology
• Pediatric Ophthalmology
• Glaucoma Research

Background:

• Elevated intraocular pressure is a major risk factor for glaucoma.
• Understanding aqueous humor outflow pathways is crucial for developing effective glaucoma treatments.
• Infant eyes may have unique outflow dynamics compared to adult eyes.

Purpose of the Study:

• To investigate the efficacy of internal trabeculotomy in reducing aqueous outflow resistance in infant eyes.
• To compare the effect of limited trabeculotomy on outflow resistance in infant versus adult eyes.
• To explore potential age-related differences in aqueous humor flow within Schlemm's canal.

Main Methods:

• Enucleated, postmortem infant eyes were used.
• Constant-pressure aqueous perfusion was applied.
• Internal trabeculotomy was performed, covering 30 degrees of the limbal circumference.

Main Results:

• Internal trabeculotomy eliminated over 50% of resistance to aqueous outflow.
• The proportion of resistance eliminated was greater in infant eyes compared to older children and adults.
• This suggests a greater capacity for circumferential flow in infant Schlemm's canal.

Conclusions:

• Limited internal trabeculotomy is highly effective in reducing aqueous outflow resistance in infant eyes.
• Infant eyes exhibit a higher capacity for circumferential aqueous humor flow in Schlemm's canal.
• This circumferential flow capacity diminishes with increasing age, highlighting developmental changes in the eye's drainage system.