Measurement of wettability of contact lenses using top view measurement method and surface fitting method

As a common item in modern life, contact lenses can not only improve daily inconvenience caused by myopia, but also make the eyes look more beautiful, which is favored by a large number of consumers.

PART.1

The importance of surface wettability of contact lenses

Contact lenses come into direct contact with the eyes, and their wettability is one of the important factors determining the comfort of wearing. The smaller the contact angle of tears on the surface of the lens, the greater their spreading degree, and the more stable the tear film formed, which can provide good moisturizing and lubricating effects on the eye surface.

*Image source network, intrusion and deletion

Plasma treatment before coating can effectively improve the surface wettability of lenses, enhance the quality of contact lenses, and improve the wearing experience for customers.

To evaluate the surface wettability of contact lenses, it is necessary to measure their contact angle size.

PART.2

How to measure the contact angle of contact lenses?

Due to the complex surface shape of contact lenses, traditional fitting methods cannot be directly used. The Shengding surface fitting method and top view measurement method can meet the measurement needs of non planar materials.

● Method for measuring contact angle of contact lenses

? Surface fitting method

The Shengding surface fitting method combined with surface modeling function can measure contact lens samples with just one click, better observe the hydrophilicity and hydrophobicity of contact lenses, and evaluate their surface wettability.

? Top view measurement method

The Shengding top view measurement method can clearly measure the concave contact angle of contact lenses from above, improving the accuracy of measurement data.

● Used to verify the effectiveness of plasma treatment

Plasma treatment is a common method to improve the surface wettability of contact lenses. The contact angle measuring instrument can be used to evaluate the effectiveness of plasma treatment.

? Comparison of contact angles before and after plasma treatment:

From the above figure, it can be seen that after plasma treatment, the contact angle of contact lenses changed from 77.465 ° to 15.648 °, and the wettability was improved.

● Contact angle measuring instrument SDC-200ST

The SDC-200ST contact angle measuring instrument has complete functions and high expansion performance. On the basis of traditional contact angle measuring instruments, the top view measurement method is added to improve the accuracy and stability of measuring contact angle data; The top view 3D method can be used to measure irregular liquid droplets, taking the average or effective contact angle value, which is more accurate than the measurement data of a single cross-section.

Binocular contact angle measuring instrument

Product advantages

● Comprehensive, comprehensive, and accurate fitting analysis methods

● Automatic liquid injection system

● Equipped with a fully automatic top view zoom lens and coaxial optical path design

● Real time tracking of measurement data and automatic generation of reports