Nanophthalmos in a Melanesian population

Area of Science:

• Ophthalmology
• Genetics
• Population Health

Background:

• Nanophthalmos is a rare congenital condition characterized by a small, hyperopic eye.
• Ophthalmic manifestations and visual impairment causes in Melanesian populations with nanophthalmos are not well-documented.

Purpose of the Study:

• To characterize the ophthalmic features of nanophthalmos in a Melanesian cohort.
• To identify the causes of visual loss in these individuals.

Main Methods:

• Observational study involving 17 Melanesian participants with nanophthalmos.
• Axial length, visual acuity, cycloplegic autorefraction, and dilated fundus examination were performed.
• Definitions for visual impairment, hypermetropia, astigmatism, anisometropia, and amblyopia were established.

Main Results:

• Short axial length (16.1-21.6 mm) and bilateral hypermetropia (+1.3 D to +15.1 D) were consistent findings.
• Crowded optic discs, papillomacular folds/bands, and macular radial folds were prevalent.
• Nine subjects had visual impairment, with amblyopia and ametropia being the primary causes.

Conclusions:

• Melanesians with nanophthalmos present with ophthalmic features indicative of intraocular crowding.
• Amblyopia and ametropia significantly contribute to visual impairment in this cohort.
• Future studies will focus on the genetic underpinnings of nanophthalmos in this population.