EFFECT OF THE LENGTH OF WEAR OF CONTACT LENSES ON CORNEAL SENSITIVITY

Acta Ophthalmologica - Tập 54 Số 6 - Trang 721-730 - 1976
Michel Millodot1
1Department of Optometry, University of Wales Institute of Science and Technology, U. K.

Tóm tắt

Corneal touch thresholds (CTT) were determined once in the morning before inserting contact lenses then after 4, 8 and 12 h of continuous wear. Two groups of subjects participated in this study; 12 persons wearing hard contact lenses and 15 wearing soft contact lenses. All subjects were perfectly adapted to their contact lenses and had worn them for not less than three months. It was found that hard contact lenses caused a progressive diminution of corneal sensitivity. After 12 h corneal sensitivity was, on average, 110% lower (that is an increase of the threshold) than in the morning. Soft lenses also caused a progressive reduction of corneal sensitivity which after 12 h wear was, on average, 45 % lower than in the morning, although there were marked differences. Moreover, 9 of the hard contact lens subjects had been tested a year earlier and it was found that their CTT after 8 h wear had slightly but not significantly diminished which indicated that these subjects had not adapted significantly to their lenses in one year.

Từ khóa


Tài liệu tham khảo

10.1097/00006324-197304000-00004

10.1136/bjo.39.12.705

10.1111/j.1755-3768.1956.tb03346.x

Bonnet R., 1965, L'esthésie cornéenne. Sa mesure dans l'obscurité, Clin. ophtal., 6, 74

10.1016/0002-9394(61)91614-2

Cochet P., 1960, L'esthésie cornéenne, Clin. ophtal., 4, 3

10.1016/0002-9394(64)91221-8

10.1001/archopht.1971.00990050653002

10.1097/00006324-197007000-00007

Ko L. S., 1963, The influence of the contact lens application on the corneal sensitivity, Trans. ophthal. Soc. (Republic of China), 2, 1

Larke J. R., 1971, A comparative study of the ocular response to two forms of contact lens, The Optician, 162, 10

Mandell R. B., 1976, Corneal edema from hard and hydrogel contact lenses, Contacto, 20, 8

10.1001/archopht.1970.00990030005003

Miller D., 1967, Effect of corneal contact lenses on corneal thickness; A case study, The Contact Lens, 1, 5

10.1136/bjo.56.11.844

10.1111/j.1755-3768.1973.tb06010.x

10.1111/j.1755-3768.1974.tb01096.x

10.1111/j.1755-3768.1975.tb01776.x

Millodot M., 1967, Effect of bending of the nylon thread of the Cochct‐Bonnet corneal aesthesiometer upon the recorded pressure, The Contact Lens, 1, 5

10.1097/00006324-197503000-00001

10.1001/archopht.1961.01840020435019

10.1001/archopht.1952.01700030336007

Tower S., 1940, Unit for sensory reception, J. Neurophysiol., 3, 456, 10.1152/jn.1940.3.6.486

Thông tin
Thông tin xuất bản

Acta Ophthalmologica

Tập 54 Số 6

721-730

Thông tin tác giả