Comparison between the preferential hyperacuity perimeter and the Amsler grid to detect age-related macular degeneration and Stargardt's disease

Abstract

Purpose To evaluate the ability of the preferential hyperacuity perimeter (PHP) and the Amsler grid to detect central scotomas in Stargardt's disease and age macular degeneration. Methods Prospective, comparative, cross-section study in which 16 patients affected with AMD and Stargardt's disease were evaluated. All patients had an optometric evaluation including refraction, best corrected visual acuity, evaluation with PHP Foresee and with the Amsler grid. The sensitivity of the macular evaluation tests (The Amsler grid and PHP) for each maculopathy was calculated. Results To detect scotomas in both macular pathologies, the PHP sensitivity is 60–70 %, while the Amsler grid sensitivity is 85–100 %. As screening methods for maculopathies, the PHP sensitivity is 83 %, while the Amsler grid sensitivity is 93 %. Conclusions The Amsler grid and the PHP are both useful to detect scotomas in Stargardt's disease and AMD. As a disease screening method, the Amsler grid is useful in both conditions; however, the PHP is only useful in AMD, not in Stargardt's.