[A new method for accommodation training].

A E Belozerov; T A Korniushina

PubMed · 9229900

[A new method for accommodation training].

Abstract

A new method for accommodation training making use of a computer is proposed. A specially generated dynamic grid of concentric rings serves the stimulus. Changes of the accommodation parameters (the nearest and farthest points of clear vision) were examined in 11 display users aged 30 to 50 during a training session and in the course of 15 sessions. The training improved the accommodation volume by an average of 0.9 diopters at the expense of approximating the nearest and withdrawing the farthest clear vision points. In 4 subjects anisoaccommodation disappeared almost completely. The proposed method may be used to normalize the accommodation of display users.

Explore related subjects

Accommodation, Ocular Adult Computer Terminals Female Humans Male Middle Aged Photic Stimulation Refraction, Ocular Refractive Errors Vision, Ocular English Abstract Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

A E Belozerov, T A Korniushina. [A new method for accommodation training].. https://pubmed.ncbi.nlm.nih.gov/9229900/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed1999

Pseudoaccommodation: BioComFold versus a foldable silicone intraocular lens.

PURPOSE: To assess the degree of pseudoaccommodation amplitude correlated with shifts along the anteroposterior axis of the BioComFold foldable intraocular lens (IOL). SETTING: Department of Ophthalmology, Hôtel-Dieu Hospital, Paris, France. METHODS: This prospective study comprised 30 eyes of 30 patients operated on consecutively for cataract by phacoemulsification and in-the-bag implantation of a BioComFold (15 patients) or a foldable control (15 patients) IOL. The BioComFold IOL has a peripheral bulging ring that pushes the optic forward during the effort to accommodate, creating a zoom effect. Pseudoaccommodation amplitude was evaluated using the blurring of controlled vision by adding spheres, with the best correction for distance vision in place. Pupil diameter was measured with a Goldmann campimeter under constant illumination. Anterior chamber depth was determined by A-scan (Paxial, Biophysic Medical) 30 minutes after cyclopentolate 1% was instilled and again 30 minutes after pilocarpine 2% was instilled. RESULTS: The difference in pseudoaccommodation amplitude and pupil diameter between the 2 groups was not statistically significant (P = .6737 and P = .4014, respectively). The IOL's forward shifts from maximal ciliary relaxation to maximal ciliary contraction were significantly greater in the BioComFold group (P = .0215). CONCLUSION: The design of the BioComFold IOL allowed greater forward optic shifts along the anteroposterior axis during the effort to accommodate. Nevertheless, this shift was not correlated with a significantly greater pseudoaccommodation amplitude.

Accommodation, Ocular↗

PubMed1998

Optical feedback controlled scleral remodeling as a mechanism for myopic eye growth.

Experimental studies of myopia have demonstrated that optical errors imposed on a developing eye will stimulate elongation of the globe, although the mechanism of axial growth is not well understood. In this study, a mathematical model of eye growth is presented in which expansion of the globe occurs as the elastic deformations of the scleral shell are incorporated into the zero stress configuration of the eye during the scleral remodeling process. The rate of remodeling is determined by the retinal blur and the amplitude of accommodation, which provide feedback loops for both unilateral and bilateral hyperopic refractive error-compensation. Normal eye growth and experimental myopia are simulated in tree shrews, a small mammal related to primates. The model demonstrates that the rate of ocular elongation in experimental myopia may be controlled by regulating the rate of soft tissue remodeling in the scleral shell.

Accommodation, Ocular↗

PubMed1998

Accommodation amplitude after lens refilling with injectable silicone by sealing the capsule with a plug in primates.

OBJECTIVE: To restore accommodation in primate eyes by refilling the lens capsule with injectable silicone compounds. MATERIALS AND METHODS: Eight eyes of 8 monkeys (Macaca fascicularis) were treated by the lens refilling procedure. To prevent leakage of the injected liquid silicone before it polymerized in the capsule in vivo, a silicone plug for sealing the capsular opening was developed. After endocapsular phacoemulsification following an upper minicircular capsulorhexis, the plug was introduced into the capsulorhexis opening. A silicone mixture was injected into the capsular bag through the delivery tube of the plug. Automated refractometry was performed 1 week and 3 months after surgery. Accommodation amplitude was determined as the difference between the refractions before and 1 hour after topical application of 4% pilocarpine chloride. RESULTS: Five of 8 eyes could be refilled. In 4 of 5 eyes, refraction could be measured. Accommodation amplitude ranged from 1.0 to 4.5 diopters, with a mean of 2.3 +/- 1.3 diopters (8.0 +/- 2.0 preoperative values). At 3-month examination, thick posterior capsule opacification precluded refractometry in all eyes. CONCLUSIONS: The lens refilling procedure with the use of a silicone plug for sealing the capsular opening was feasible in primate eyes. The accommodation amplitude attained was a small fraction of the value before surgery. This may result from the loss of so-called intracapsular accommodation, ie, active participation of lens fiber cells in accommodation. However, since the obtained accommodation may be sufficient for near vision after cataract surgery, this lens refilling procedure warrants further study. Elucidation of the mechanism of intracapsular accommodation may also be necessary.

Accommodation, Ocular↗