ABSTRACT
Prognostic value of acoustic density of sclera (ADS) is studied in development of peripheral vitreochorioretinal degenerations (PVCRD) in myopia. Children aged 8-10 years old with noncomplicated high and moderate myopia were divided into two groups after ADS measurement: 1 with ADS < or = 39dB - unfavorable prognosis, 2 with ADS >39dB - favorable prognosis. Follow-up during 10 years with examinations twice a year confirmed prognosis accuracy: in the 1st group PVCRD developed 2.5 times as often as in the 2nd group (64.6 and 25.6% respectively).
Subject(s)
Myopia , Retinal Degeneration , Sclera/diagnostic imaging , Ultrasonography/methods , Child , Disease Progression , Female , Humans , Male , Myopia/complications , Myopia/diagnosis , Myopia/physiopathology , Ophthalmoscopy/methods , Prognosis , Refraction, Ocular , Retinal Degeneration/diagnosis , Retinal Degeneration/etiology , Retinal Degeneration/physiopathology , Sclera/pathology , Sclera/physiopathology , Severity of Illness IndexABSTRACT
To study the possibility of corneal contribution to process of accommodation in myopic eyes we examined 4 groups of patients: children and adolescents with low (1st group) to moderate (2nd group) myopia, young adults with moderate to high myopia after LASIK (3rd group) and PRK (4th group). Corneal optic power was measured using binocular open-field autoreferatometer in vertical and horizontal meridians for near (33 sm) and distant (5 m) fixation. No significant difference was found in children and adolescents with low and moderate myopia with intact cornea, as well as in young adults with moderate to high myopia after keratorefractive surgery. The optic corneal power tends to be moderately lower in horizontal meridian, but this difference is not significant. The revealed data do not support significant contribution of cornea into accommodation of the myopic eye.
Subject(s)
Accommodation, Ocular/physiology , Cornea/pathology , Myopia/pathology , Adolescent , Adult , Child , Cornea/physiopathology , Corneal Topography , Humans , Myopia/physiopathology , Refraction, Ocular , Visual Acuity , Young AdultSubject(s)
Myopia/physiopathology , Sclera/physiopathology , Elasticity , Humans , Myopia/etiology , Myopia/pathology , Ophthalmology/methods , Sclera/pathologyABSTRACT
Acoustic density of the sclera (ADS) was examined using ultrasonic scanning device Ophthascan-B in 121 eyes of 91 patients aged 9 to 17 with progressive myopia of 3.5 to 14.0 diopters. ADS of the posterior pole and eyeball equator were measured separately. ADS in health was 47.6ë0.24 dB for the posterior pole and 46.0ë0.24 dB for the equator, in myopia 41.7ë0.26 and 38.8ë0.22 d, respectively. ADS in the eyes with myopia developing at school age was reliably higher than in cases with congenital and early acquired myopia. The lowest ADS values for both the posterior pole and equator were detected in patients with high early acquired myopia.
