Owen, J.
Plaintiff in error, hereinafter called appellant, was convicted of a violation of the statute regulating the practice of optometry, which prohibits the same withouc first having secured a license therefor, as provided by the act. His principal defenses are (1) that he did not violate the act, in that the proof did not show he was practicing optometry as defined therein; and (2) that the act is unconstitutional. The act was first enacted as ch. 488, Laws 1915, and, as amended by sec. 80, ch. 14, and sec. 2, ch. 357, Laws 1917, appears in the Statutes as sec. 1435/ — 35.
It seems proper first to consider whether the law is a constitutional enactment. In this day it is but trite to say that the state may legislate in the interest of the public health and do protect its citizens from the fraud and imposition resulting from the practice of a trade or profession, calling for skill and learning, by those who are incompetent. Statutes requiring those who hold themselves out as competent to serve the public, as lawyers, physicians, dentists, osteopaths, pharmacists, plumbers, barbers, and the like, to prove their competency before, and secure a license from, some public authority, to engage or continue in their calling, are sustained by virtue of this power. Although the regulation of the practice of optometry is a comparatively recent idea, upwards of forty states of the Union; as we are informed by appellant’s brief, have legislated upon the subject. This is indicative of a decidedly preponderating opinion on the part of the American people on the subject and indicates that the legislation under consideration is not the product of legislative caprice. It appears, too-, that this class of legislation has received quite general acquiescence on the part of those affected thereby, as we have been referred to but two cases (McNaughton v. Johnson, 242 U. S. 344, 37 Sup. Ct. 178, and People v. Griffith, 280 Ill. 18, 117 N. E. 195) in which laws of this nature have received judicial consideration. An extended review of these cases will serve no good purpose, as in the McNmghton Case the power of the state of [610]*610California to enact the law was not considered, although it seems to have been assumed; and in so far as the Griffith Case denies the power of the state to enact such legislation we are not impressed with the logic thereof.
If the practice of optometry bears some real relation to the public health, or if it calls for special skill and knowledge on the part of those practicing it, so that the people should be protected from fakirs and incompetents who hold themselves out as competent to engage therein, then the legislation is within the power of the state. That it does have a real and direct bearing upon the public health cannot be doubted. There are many ailments that are attributable to defective eye-sight which disappear when the vision is corrected by properly-fitting glasses. To properly diagnose and prescribe for the particular defect from which the patient is suffering requires a knowledge of the anatomy of the eye as well as the subject of physical optics, being that branch of the general subject of physics which deals with the action or effect of lenses on,light and how light is directed, reflected, and refracted. It also- 'requires familiarity with the spectrum, the ophthalmoscope, the retinoscope, the ophthal-mometer, and the photometer. If this is not a matter of common knowledge, it is supplied by the expert testimony taken in the case, a portion of which is set out in the statement of facts.- By a reference to- this testimony we are further informed that glasses which satisfy the patient are frequently improper, and that glasses which at the time do- not seem comfortable should be insisted upon. With these facts in mind; it is apparent that a person lacking in the requisite degree of skill and learning who holds himself out as competent to practice optometry might bring harm rather than benefit to those who consult and confide in him. In the interest of the public welfare and to protect the citizens from such impositions it is competent for the state to require that those assuming to practice the profession shall possess a specified minimum degree of skill and learning. The legislation is, therefore, within the police power of the state.
[611]*611While this law prevents many who were engaged in the practice of optometry at the time of its enactment from a continuance thereof, it is well settled that it is not, for that reason, ex post facto, which is one of the grounds urged against its validity. Hawker v. New York, 170 U. S. 189, 18 Sup. Ct. 573; Reetz v. Michigan, 188 U. S. 505, 23 Sup. Ct. 390; Nelson v. State, 167 Wis. 515, 167 N. W. 807. Neither does it take property without due process of law, as urged. Laws similar to this, by which persons engaged in the practice of a trade or profession have been prohibited from the further pursuance thereof until their competency was demonstrated and they received a license so to do, have been frequent. The right of the legislature thus to deprive citizens of the right of pursuing their chosen callings has been fully established and universally recognized. A no more authoritative or illuminating statement upon this question can be found than the remarks of Mr. Justice Field in the case of Dent v. West Virginia, 129 U. S. 114, 9 Sup. Ct. 231, where he said:
“It is undoubtedly the right of every citizen of the United States to follow any lawful calling, business, or profession he may choose; subject only to such restrictions as are imposed upon all persons of like age, sex, and condition. This right may in many respects be considered as a distinguishing feature of our republican institutions. Here all vocations are open to every one on like conditions. All may be pursued as sources of livelihood, some requiring years of study and great learning for their successful prosecution. The interest o:r, as it is sometimes termed, the estate acquired in them, that is, the right to continue their prosecution, is often of great value to the possessors, and cannot be arbitrarily taken from them, any more than their real Or personal property can be thus taken. But there is no arbitrary deprivation of such right where its exercise is not permitted because of a failure to comply with conditions imposed by the state for the protection of society. The power of the state to provide for the general welfare of its people authorizes it to prescribe all such regulations as, in its judgment, will secure or tend to secure them against the consequences of ignorance and incapacity as well as of deception and fraud. As one [612]*612means to this end it has been the practice of different states, from time immemorial, to exact in many pursuits a certain degree of skill and learning upon which the community may confidently rely, their possession being generally ascertained upon an examination of parties by competent persons, or inferred from a certificate to them in the form oí a diploma or license from an institution established for instruction on the subjects, scientific or otherwise, with which such pursuits have to deal. The nature and extent of the qualifications required must depend primarily upon the judgment of the state as to their necessity.
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Owen, J.
Plaintiff in error, hereinafter called appellant, was convicted of a violation of the statute regulating the practice of optometry, which prohibits the same withouc first having secured a license therefor, as provided by the act. His principal defenses are (1) that he did not violate the act, in that the proof did not show he was practicing optometry as defined therein; and (2) that the act is unconstitutional. The act was first enacted as ch. 488, Laws 1915, and, as amended by sec. 80, ch. 14, and sec. 2, ch. 357, Laws 1917, appears in the Statutes as sec. 1435/ — 35.
It seems proper first to consider whether the law is a constitutional enactment. In this day it is but trite to say that the state may legislate in the interest of the public health and do protect its citizens from the fraud and imposition resulting from the practice of a trade or profession, calling for skill and learning, by those who are incompetent. Statutes requiring those who hold themselves out as competent to serve the public, as lawyers, physicians, dentists, osteopaths, pharmacists, plumbers, barbers, and the like, to prove their competency before, and secure a license from, some public authority, to engage or continue in their calling, are sustained by virtue of this power. Although the regulation of the practice of optometry is a comparatively recent idea, upwards of forty states of the Union; as we are informed by appellant’s brief, have legislated upon the subject. This is indicative of a decidedly preponderating opinion on the part of the American people on the subject and indicates that the legislation under consideration is not the product of legislative caprice. It appears, too-, that this class of legislation has received quite general acquiescence on the part of those affected thereby, as we have been referred to but two cases (McNaughton v. Johnson, 242 U. S. 344, 37 Sup. Ct. 178, and People v. Griffith, 280 Ill. 18, 117 N. E. 195) in which laws of this nature have received judicial consideration. An extended review of these cases will serve no good purpose, as in the McNmghton Case the power of the state of [610]*610California to enact the law was not considered, although it seems to have been assumed; and in so far as the Griffith Case denies the power of the state to enact such legislation we are not impressed with the logic thereof.
If the practice of optometry bears some real relation to the public health, or if it calls for special skill and knowledge on the part of those practicing it, so that the people should be protected from fakirs and incompetents who hold themselves out as competent to engage therein, then the legislation is within the power of the state. That it does have a real and direct bearing upon the public health cannot be doubted. There are many ailments that are attributable to defective eye-sight which disappear when the vision is corrected by properly-fitting glasses. To properly diagnose and prescribe for the particular defect from which the patient is suffering requires a knowledge of the anatomy of the eye as well as the subject of physical optics, being that branch of the general subject of physics which deals with the action or effect of lenses on,light and how light is directed, reflected, and refracted. It also- 'requires familiarity with the spectrum, the ophthalmoscope, the retinoscope, the ophthal-mometer, and the photometer. If this is not a matter of common knowledge, it is supplied by the expert testimony taken in the case, a portion of which is set out in the statement of facts.- By a reference to- this testimony we are further informed that glasses which satisfy the patient are frequently improper, and that glasses which at the time do- not seem comfortable should be insisted upon. With these facts in mind; it is apparent that a person lacking in the requisite degree of skill and learning who holds himself out as competent to practice optometry might bring harm rather than benefit to those who consult and confide in him. In the interest of the public welfare and to protect the citizens from such impositions it is competent for the state to require that those assuming to practice the profession shall possess a specified minimum degree of skill and learning. The legislation is, therefore, within the police power of the state.
[611]*611While this law prevents many who were engaged in the practice of optometry at the time of its enactment from a continuance thereof, it is well settled that it is not, for that reason, ex post facto, which is one of the grounds urged against its validity. Hawker v. New York, 170 U. S. 189, 18 Sup. Ct. 573; Reetz v. Michigan, 188 U. S. 505, 23 Sup. Ct. 390; Nelson v. State, 167 Wis. 515, 167 N. W. 807. Neither does it take property without due process of law, as urged. Laws similar to this, by which persons engaged in the practice of a trade or profession have been prohibited from the further pursuance thereof until their competency was demonstrated and they received a license so to do, have been frequent. The right of the legislature thus to deprive citizens of the right of pursuing their chosen callings has been fully established and universally recognized. A no more authoritative or illuminating statement upon this question can be found than the remarks of Mr. Justice Field in the case of Dent v. West Virginia, 129 U. S. 114, 9 Sup. Ct. 231, where he said:
“It is undoubtedly the right of every citizen of the United States to follow any lawful calling, business, or profession he may choose; subject only to such restrictions as are imposed upon all persons of like age, sex, and condition. This right may in many respects be considered as a distinguishing feature of our republican institutions. Here all vocations are open to every one on like conditions. All may be pursued as sources of livelihood, some requiring years of study and great learning for their successful prosecution. The interest o:r, as it is sometimes termed, the estate acquired in them, that is, the right to continue their prosecution, is often of great value to the possessors, and cannot be arbitrarily taken from them, any more than their real Or personal property can be thus taken. But there is no arbitrary deprivation of such right where its exercise is not permitted because of a failure to comply with conditions imposed by the state for the protection of society. The power of the state to provide for the general welfare of its people authorizes it to prescribe all such regulations as, in its judgment, will secure or tend to secure them against the consequences of ignorance and incapacity as well as of deception and fraud. As one [612]*612means to this end it has been the practice of different states, from time immemorial, to exact in many pursuits a certain degree of skill and learning upon which the community may confidently rely, their possession being generally ascertained upon an examination of parties by competent persons, or inferred from a certificate to them in the form oí a diploma or license from an institution established for instruction on the subjects, scientific or otherwise, with which such pursuits have to deal. The nature and extent of the qualifications required must depend primarily upon the judgment of the state as to their necessity. If they are appropriate to the calling or profession, and attainable by reasonable study or application, no objection to their validity can be raised because of their stringency or difficulty. It is only when they have no relation to such calling or profession, or are unattainable by such reasonable study and application, that they can operate to deprive one of his right to pursue a lawful vocation.”
It is also suggested that the law is invalid because it permits persons to select their own glasses when, as the evidence shows, harm may result therefrom. This is akin to an argument that the law regulating the practice of medicine is void because it does not prohibit the individual from buying a standard or patent remedy for a common ailment. At the risk of dignifying the suggestion we will say, in the first place, that the legislature has not assumed to protect the individual from his own folly. The legislation merely aims to secure a minimum of knowledge on the part of those who hold themselves out as competent to practice optometry. In the second place, an attempt of the legislature to suppress or minimize an evil is not to be held innocuous because it does not entirely eradicate it.
“It is established by repeated decisions that a statute aimed at what is deemed an evil is not to be upset by thinking up and enumerating other instances to which it might have been applied equally well, so far as the court can see.” Keokee C. C. Co. v. Taylor, 234 U. S. 224, 34 Sup. Ct. 856.
“Legislatures have the constitutional power to make unwise classifications.” Heath & Milligan M. Co. v. Worst, 207 U. S. 338 (28 Sup. Ct. 114), at p. 357.
[613]*613“In a classification for governmental purposes there cannot be an exact exclusion or inclusion of persons and things.” Ozan L. Co. v. Union Co. Nat. Bank, 207 U. S. 251 (28 Sup. Ct. 89), at p. 256.
“It is no' sufficient argument against this or any classification that it either may or does exclude individuals as well or better qualified than some which it includes.” State ex rel. Kellogg v. Currens, 111 Wis. 431, 87 N. W. 561.
“Nor is classification to- be condemned by the courts because the situation of certain individuals in one class may not differ materially from the situation of certain individuals in another class. Such is frequently the case. It is the class, considered broadly as a class, which must possess the distinguishing differences of situation calling for different legislation, not every individual in the class.” Kiley v. C., M. & St. P. R. Co. 142 Wis. 154, 159, 125 N. W. 464.
These, among other authorities which might be cited almost indefinitely, thoroughly establish the proposition that as to matters of classification the legislature has a very broad discretion, and that its judgment with reference thereto will be respected and enforced by the courts unless the classification is so arbitrary that there is no conceivable basis in reason therefor.
The foregoing also disposes of the objection that the law is void because physicians and surgeons, and persons who sell spectacles without attempting to test the eyes, are exempted from the provisions of the law. The propriety of the exemptions is so manifest that discussion of the reasons therefor would be but to attempt to' demonstrate'the obvious.
Sub. 6, sec. 1435/ — 35, Stats., provides that
“Any person who has been admitted to practice optometry in any other state may be permitted to practice optometry in this state, in the discretion of the board, upon payment of a registration fee of ten dollars and production of a certificate showing that he has passed an examination in such other state, and has actually practiced optometry therein for a term of two years.” i
Appellant claims that this amounts to a discrimination against residents of this state because the act favors non[614]*614residents. We do not think so. The legislature simply demands of every person engaged in the practice of optometry in this state certain qualifications. It has declared how such qualifications may be ascertained. As to those who reside within this state, and all others for that matter, they may be ascertained by the examination provided for in the law. This, however, is not the exclusive way. The legislature has seen fit to declare that a certificate of examination from another state may be taken as evidence in this state that the person presenting such certificate does have the qualifications required. This is not unusual. For instance, the statutes of this state prescribe three distinct methods by which the qualifications of persons to practice law may be demonstrated. One is an examination by the state board of bar examiners. Another, a diploma of the law department of the University of Wisconsin. A third, a certificate of admission to practice in the court of last resort of another state, together with proof that the applicant has been engaged in the actual practice in such state for five years within the last eight years prior to filing his application. It has never been suggested that this amounts to a discrimination by or against any one. Manifestly it amounts to but three different ways by which the qualifications ,of those desiring tO' enter upon the practice of law may be ascertained. Similarly the law in question provides two' ways in which that fact may be demonstrated. We see no reason why the legislature may not make a certificate showing that the applicant has passed an examination in another state proof of the fact that he possesses the qualifications requisite under the law of this state.
The next question is whether the evidence shows a violation of the law. The law defined the practice of optometry as “The employment of any means, other than the use of drugs, for the measurement of the powers of vision and the adaption of lenses for the aid thereof.” Sub. 1, sec. 1435/ — 35, Stats. 1917. Did appellant employ any means [615]*615other than the use of drugs for the measurement of the powers of vision and the adaption of lenses for the aid thereof? We are satisfied that this should be answered in the affirmative. This was not a case where a customer simply picked out her own glasses by trying on pair after pair until she found a pair which satisfied her. She first went to his office, but, because he was not there, she was unable to procure her glasses. It appears, however, that his wife was there, and had it not been her purpose tO' have her eyes tested she might as well have picked out a pair of glasses without his presence. She did not do so, but left word that he should go tO' her home. He did so. “He put a big frame on my face and tested my eyes.” “He gave one of my girls a card and they had to stand far away.” “He asked me if I could see, and every time he would put a different glass on. He asked me to' read as far as I could, until finally he found that my eyes was good, and then he gave me a pair of even glasses.” The “big frame” testified to suggests the try-frame, which is one of the instruments used by optometrists for the measurement of the powers of vision. When we consider that the appellant is here insisting that he has a right to- practice optometry and that the law which prohibits him from doing so is void; that he has taken three unsuccessful examinations for the purpose of securing a license therefor, coupled with the evidence above referred to, the inference that he used the big frame and the test card “for the measurement of the powers of vision and the adaption of lenses for the aid thereof” is justifiable.
Appellant raises a question concerning the construction of the statute which should be mentioned. Sub. 17 of the act (sec. 1435/ — 35, Stats. 1917) provides, in effect, that every person who shall practice optometry after the 1st day of January, 1916, without having obtained a certificate of examination and of registration, or who, not having obtained such certificate, shall hold himself out to the public as qualified to engage in the practice of optometry as defined jn [616]*616this section, shall be guilty of a misdemeanor, etc. Sub. 19 provides that “Nothing in this section shall be construed to apply to physicians and surgeons authorized to practice under the laws of this state, nor to persons who shall sell spectacles from an established place of business without attempting to test the eyes.” It is argued that one who- sells spectacles without attempting to test the eyes is exempt from the provisions of the law, therefore a person who sells spectacles in that way may hold himself out to the public as qualified to engage in the practice of optometry and the public may be misled in the belief that they were purchasing spectacles from a skilled and qualified optometrist. It is quite apparent that the legislature did not intend any such result. It was the purpose of the legislature to prevent any one from holding himself out to the public as qualified to engage in the practice of optometry. It was also quite plainly-the intent of the legislature to permit persons to sell spectacles so long as they did so without attempting to test the eyes. To permit one who- sells spectacles, without attempting to test the eyes, to hold himself out to the public as qualified to engage in the practice of optometry, would of course be absurd, and statutes are not to be so construed as to result in an absurdity. State ex rel. Husting v. Board of State Canv. 159 Wis. 216 (150 N. W. 542), at p. 227.
In the construction of statutes we should “look to the whole and every part of the law, to the intent apparent from the whole, to the subject matter, to the effect and consequences, to the reason and spirit, and thereby ascertain-the ruling idea present in the legislative mind at the time of its enactment, and then, if .the manifest purpose of the lawmakers can thereby be reasonably spelled out of the words they used to express it, to give effect to- such purpose, though the meaning thus adopted be quite contrary to- the literal sense of the words.” Wis. Ind. School v. Clark Co. 103 Wis. 651 (79 N. W. 422), at p. 659; State ex rel. McGrael v. Phelps, 144 Wis. 1, 128 N. W. 1041. The intent of the legislature in passing this law is not difficult of ascertain[617]*617ment. It was intended to prevent any one from practicing optometry, or from holding himself out as competent to practice optometry, until a license to do so had been secured as provided in the act. It was also intended to exempt from the provisions of the law persons who simply sold spectacles over the counter, where the customer makes his own selection and there is no attempt on the part of the salesman to test the eyes. We so construe the statute.
It follows from what has been said that we discover nothing invalid about the law, and that the proof shows that the appellant violated it. It follows that the judgment should be affirmed.
By the Court. — Judgment affirmed.